function echeck(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 Email Address");return false;}
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){alert("Invalid Email Address");return false;}
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){alert("Invalid Email Address");return false;}
	if (str.indexOf(at,(lat+1))!=-1){alert("Invalid Email Address");return false;}
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){alert("Invalid Email Address");return false;}
	if (str.indexOf(dot,(lat+2))==-1){alert("Invalid Email Address");return false;}
	if (str.indexOf(" ")!=-1){alert("Invalid Email Address");return false;}
	if (str.substring(str.length-1,str.length)==dot){alert("Invalid Email Address");return false;}
	return true;
}

function ValidateEmail(emailInputName){
	var emailID = document.getElementById(emailInputName);
	if ((emailID.value==null)||(emailID.value=="")){alert("Please Enter your Email Address");emailID.focus();return false;}
	if (echeck(emailID.value)==false){emailID.select();emailID.focus();return false;}
	return true;
}