function validateEmail()
{
	if(isEmailId(frmemail.emailid.value))
	{
		return true;
	}
	else
	{
		alert("Please Provide Your Valid E-mail Address.");
		frmemail.emailid.focus();
		frmemail.emailid.select();
		return false;
	}
}

function isEmailId(parEmailId)
{
	var state=true;
	var count=0;
	var counta=0;
	var ErrMsg="";

	//no successive two dots
	for(var i=0; i<parEmailId.length-1; i++)
		if((parEmailId.charAt(i)==".")&&(parEmailId.charAt(i+1)=="."))
			state=false;                               
	//no successive two '@'
	for(var i=0; i<parEmailId.length-1; i++)
		if((parEmailId.charAt(i)=="@")&&(parEmailId.charAt(i+1)=="@"))
			state=false;                               


	//no successive '.'and'@'
	for(var i=0; i<parEmailId.length-1; i++)
		if((parEmailId.charAt(i)==".")&&(parEmailId.charAt(i+1)=="@"))
			state=false;

	//no successive'@' and '.'
	for(var i=0; i<parEmailId.length-1; i++)
		if((parEmailId.charAt(i)=="@")&&(parEmailId.charAt(i+1)=="."))
			state=false;

	//the number of "." should be atleast one
	for(i=0; i<parEmailId.length;i++)
	{
		if(parEmailId.charAt(i)==".")
			count=count+1;
	}
	
	if(count<1)
		state=false;

	//the first and last char cannot be "."
	var l= parEmailId.length;
		if((parEmailId.charAt(0)==".")||(parEmailId.charAt(l-1)=="."))
			state=false;
	
	//the first and last char cannot be "@"
	var l= parEmailId.length;
		if((parEmailId.charAt(0)=="@")||(parEmailId.charAt(l-1)=="@"))
			state=false;
	
	//aleast one "@"
	for(i=0; i<parEmailId.length;i++)
	{
		if(parEmailId.charAt(i)=="@")
			counta=counta+1;
	}
	if(counta<1)
		state=false;

	
	return state;
}