//-----function to trim the entered values

function Trim(sString)
{
	return leftTrim(rightTrim(sString));
}
function leftTrim(sString)
{
	while (sString.substring(0,1) == ' ')
	{
		sString = sString.substring(1, sString.length);
	}
	return sString;
}

function rightTrim(sString)
{
	while (sString.substring(sString.length-1, sString.length) == ' ')
	{
		sString = sString.substring(0,sString.length-1);
	}
	return sString;
}
//-----------function for null validation----------
function validRequired(formField,fieldLabel) 
{
	var result = true;
	if (Trim(formField.value) == "")
	{
		alert('Please Enter ' + fieldLabel +' ');
		formField.focus();
		result = false;
	}
	return result;
}
//--------function to validate email----------

function validEmail(str,formField) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if(str=="")
		{
			alert('Please enter Email Address');
			formField.focus();
			return false;
		}	
		if (str.indexOf(at)==-1){
		   alert("Please enter a valid Email Address");
		   formField.focus();
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Please enter a valid Email Address");
		   formField.focus();
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Please enter a valid Email Address");
			formField.focus();
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Please enter a valid Email Address");
			formField.focus();
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Please enter a valid Email Address");
			formField.focus();
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Please enter a valid Email Address");
			formField.focus();
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Please enter a valid Email Address");
			formField.focus();
		    return false
		 }

 		 return true					
	}