function clear_textbox()
{
	if(document.getElementById("email").value == 'Enter Your Email Address Here')
	document.getElementById("email").value = ''
}

function check(form)
{
	if(document.getElementById("email").value == '' )
	{
		alert("Email not provided");
		return false;
	}
	else
	{
		if(echeck(document.getElementById("email").value))
		{
			closing =false;
		window.location="results.php?email="+document.getElementById("email").value+"&aff="+document.getElementById("aff").value+"&campid="+document.getElementById("campid").value+"&pop="+document.getElementById("pop").value;
			return false;
		}
		else
		{
			return false;
		}
	}
}
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 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					
	}