function validate_input()
{
	var validate = false;
	validate = CheckNull('email', 'Email');
	if(!validate)
	{	
		return validate;
	}		
	validate = CheckEmail('email');

	if(!validate)
	{	
		return validate;
	}	
	return validate;
}


function CheckNull(objID, msg){
	var obj=document.getElementById(objID);
	var text = obj.value;
	text = text.replace(/^\s*|\s*$/g,"");
	if ((text==null)||(text=="")){
		alert('Please enter your ' + msg + '.' )
		obj.focus()
		return false
	}
	return true;
}
//email validation
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('Please enter a valid Email Address (an "@" and "." are needed).');
		   return false
		}
		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert('Please enter a valid Email Address (an "@" and "." are needed).');
		   return false
		}
		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert('Please enter a valid Email Address (an "@" and "." are needed).');
		    return false
		}
		 if (str.indexOf(at,(lat+1))!=-1){
		    alert('Please enter a valid Email Address (an "@" and "." are needed).');
		    return false
		 }
		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert('Please enter a valid Email Address (an "@" and "." are needed).');
		    return false
		 }
		 if (str.indexOf(dot,(lat+2))==-1){
		    alert('Please enter a valid Email Address (an "@" and "." are needed).');
		    return false
		 }
		 if (str.indexOf(" ")!=-1){
		    alert('Please enter a valid Email Address (an "@" and "." are needed).');
		    return false
		 }
 		 return true					
	}

function CheckEmail(email){
	var emailID=document.getElementById(email);
	var text = emailID.value;
	text = text.replace(/^\s*|\s*$/g,"");
	if ((text==null)||(text=="")){
		alert('Email address cannot be empty.')
		emailID.focus()
		return false
	}
	if (echeck(text)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
 }