function is_blank(form_name, element_name, error_message){
	if(document.forms[form_name].elements[element_name].value==""||document.forms[form_name].elements[element_name].value==null)
	{
		alert(error_message);
		document.forms[form_name].elements[element_name].focus();
		return true;
	}

	return false;
}


function is_integer(form_name, element_name, error_message){
	var i;
	var s=document.forms[form_name].elements[element_name].value;
    for (i = 0; i < s.length; i++){
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))){
			alert(error_message);
			document.forms[form_name].elements[element_name].focus();
	        return false;
        }
    }
    // All characters are numbers.
    return true;
}


function is_number(form_name, element_name, error_message){
	if(isNaN(document.forms[form_name].elements[element_name].value)){
		alert(error_message);
		document.forms[form_name].elements[element_name].focus();
	    return false;
	}

    return true;
}

/*Check if in a text box array there is any  non numeric or whole number exist*/
function scan_number_array(form_name, element_name, error_message){
	var isNumber = true;
	var selectedLength = document.forms[form_name].elements[element_name].length;
	for(var i=0; i<selectedLength&&isNumber; i++)
	{ 
		var j;
		var s=document.forms[form_name].elements[element_name][i].value;
		
		for (j = 0; j < s.length; j++){
			// Check that current character is number.
			var c = s.charAt(j);
			if (((c < "0") || (c > "9"))){
				alert(error_message);
				document.forms[form_name].elements[element_name][i].focus();
				isNumber = false;
				break;
			}
		}
		//check if the value is greater than 3
		//alert(document.forms[form_name].elements[element_name][i].value);
/*		
		if(parseInt(page_no)==0)
		{
			if(parseInt(i)>2&&isNumber&&parseInt(document.forms[form_name].elements[element_name][i].value)<4)
			{
				alert(error_message);
				document.forms[form_name].elements[element_name][i].focus();
				isNumber = false;
				break;
			}
		}
		else
		{
			if(isNumber&&parseInt(document.forms[form_name].elements[element_name][i].value)<4)
			{
				alert(error_message);
				document.forms[form_name].elements[element_name][i].focus();
				isNumber = false;
				break;
			}
		}
*/
	}
	   
	if(!isNumber)
		return false;
	
	return true;
}
/**/

function numeric_comparison(form_name, element_name_one, element_name_two, error_message){
	var value_one=document.forms[form_name].elements[element_name_one].value-0;
	var value_two=document.forms[form_name].elements[element_name_two].value-0;

	if(value_one>value_two){
		alert(error_message);
		document.forms[form_name].elements[element_name_one].focus();
	    return false;
	}

    return true;
}

function is_valid_url(form_name, element_name, error_message){
	var v = new RegExp();
    v.compile("^[A-Za-z]+://[A-Za-z0-9-_]+\\.[A-Za-z0-9-_%&\?\/.=]+$");
    if (!v.test(document.forms[form_name].elements[element_name].value)) {
       	alert(error_message);
		document.forms[form_name].elements[element_name].focus();
		return true;
	}
	
	return false;
}

/*image validation starts*/
function is_valid_image(form_name, element_name, width, height){
   var imgExt = document.forms[form_name].elements[element_name].value.split(".");
   var ext = imgExt[imgExt.length - 1];

	if(ext.toUpperCase() != "JPEG" && ext.toUpperCase() != "JPG" && ext.toUpperCase() != "PNG" && ext.toUpperCase() != "GIF")
	{
		alert('Only JPEG, PNG and GIF Images can be uploaded');
		document.forms[form_name].elements[element_name].focus();
		return true;
	}
	else
	{
	   var imgTest = new Image();
	   imgTest.src = document.forms[form_name].elements[element_name].value;
	   if(imgTest.width > width || imgTest.height > height)
	   {
			alert("The size of the image to be uploaded should not be greater than " + width + "w x " + height + "h pixels");
			document.forms[form_name].elements[element_name].focus();
			return true;				
	   }
	}
}

/*image validation ends*/

/*deleting multiple records*/
function is_checked_multiple(form_name, element_name){
	/* check if any of the checkboxes selected */

	var isChecked = false;
	var selectedLength = document.forms[form_name].elements[element_name].length;
	if(selectedLength)
	{
		for(var i=0; i<selectedLength; i++)
		{ 
			if(document.forms[form_name].elements[element_name][i].checked)			
		   	{
				isChecked = true;
				break;
			}
		}
	}
	else
	{
		if(document.forms[form_name].elements[element_name].checked)			
			isChecked = true;
	}
	   
	if(isChecked)
	{
		if(confirm("Are you sure you want to delete the selected record(s)?"))
			return false
	}
	else
		window.alert("Select atleast one record");
	
	return true;
}
/**/



function validate_email(str){
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if(str.indexOf(at)==-1){
	   //alert("Invalid E-mail ID")
	   return false
	   }
	if(str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		//alert("Invalid E-mail ID")
		return false
		}
	if(str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		//alert("Invalid E-mail ID")
		return false
  		}
	if(str.indexOf(at,(lat+1))!=-1){
	    //alert("Invalid E-mail ID")
	    return false
	    }
	 if(str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
	    //alert("Invalid E-mail ID")
	    return false
		}
	 if(str.indexOf(dot,(lat+2))==-1){
	    //alert("Invalid E-mail ID")
	    return false
	    }
	 if(str.indexOf(" ")!=-1){
	    //alert("Invalid E-mail ID")
	    return false
		}
	 return true

}
/************************** end of function validateEmail ****************************/



/************************** All Trim starts ***********************************/
function trimAll(sString)
{
while (sString.substring(0,1) == ' ')
{
sString = sString.substring(1, sString.length);
}
while (sString.substring(sString.length-1, sString.length) == ' ')
{
sString = sString.substring(0,sString.length-1);
}
return sString;
}
/************************** All Trim ends ***********************************/



/************************** date validation starts ***********************************/
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   }
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year")
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function validate_date(dt)
{

	if (isDate(dt)==false)
	{
		return false
	}
    return true
 }
/************************** date validation ends ***********************************/


/************************** date comparison ends ***********************************/

function date_comparison(form_name, element_name_one, element_name_two, error_message){
  var sDate = new Date(document.forms[form_name].elements[element_name_one].value);
  var eDate = new Date(document.forms[form_name].elements[element_name_two].value);
  if (sDate >eDate){
    alert (error_message);
	document.forms[form_name].elements[element_name_one].focus();
	return true;
  }
  
  return false;
 }

/************************** time validation starts ***********************************/ 
function checktime(thetime, error_message) {
	var a,b,c,f,err=0;
	a=thetime.value;
	if (a.length != 5) err=1;
	b = a.substring(0, 2);
	c = a.substring(2, 3); 
	f = a.substring(3, 5); 
	if (/\D/g.test(b)) err=1; //not a number
	if (/\D/g.test(f)) err=1; 
	if (b<0 || b>23) err=1;
	if (f<0 || f>59) err=1;
	if (c != ':') err=1;
	if (err==1) {
		alert (error_message);
		thetime.focus();
		return false
	}
	return true;
}