function checkrefer(){
document.getElementById('yourname').value = trim(document.getElementById('yourname').value);
document.getElementById('youremail').value = trim(document.getElementById('youremail').value);
document.getElementById('friendname1').value = trim(document.getElementById('friendname1').value);
document.getElementById('friendemail1').value = trim(document.getElementById('friendemail1').value);
document.getElementById('friendname2').value = trim(document.getElementById('friendname2').value);
document.getElementById('friendemail2').value = trim(document.getElementById('friendemail2').value);
document.getElementById('friendname3').value = trim(document.getElementById('friendname3').value);
document.getElementById('friendemail3').value = trim(document.getElementById('friendemail3').value);

if(!isName(document.getElementById('yourname'))){ 
		alert("Please enter your name");
		document.getElementById('yourname').focus();
		return false;
	}
document.getElementById('yourname').value = (document.getElementById('yourname').value).ucfirst();
if(document.getElementById('youremail').value==""){ 
		alert("Please enter e-mail id");
		document.getElementById('youremail').focus();
		return false;
	}
	if (document.getElementById('youremail').value!="" && !valid_email(document.getElementById('youremail').value)){ 
		alert("Please enter valid email id");
		document.getElementById('youremail').focus();
		return false;
	}
	document.getElementById('youremail').value = (document.getElementById('youremail').value).toLowerCase();
	
	
if(!isName(document.getElementById('friendname1'))){ 
		alert("Please enter friend's name");
		document.getElementById('friendname1').focus();
		return false;
	}
document.getElementById('friendname1').value = (document.getElementById('friendname1').value).ucfirst();
if(document.getElementById('friendemail1').value==""){ 
		alert("Please enter friend's e-mail id");
		document.getElementById('friendemail1').focus();
		return false;
	}
	if (document.getElementById('friendemail1').value!="" && !valid_email(document.getElementById('friendemail1').value)){ 
		alert("Please enter friend's e-mail id");
		document.getElementById('friendemail1').focus();
		return false;
	}
	document.getElementById('friendemail1').value = (document.getElementById('friendemail1').value).toLowerCase();
	
	
	if (document.getElementById('friendemail2').value!="" || document.getElementById('friendname2').value!="" ){ 
				if(!isName(document.getElementById('friendname2'))){ 
					alert("Please enter friend's name");
					document.getElementById('friendname2').focus();
					return false;
				}
				document.getElementById('friendname2').value = (document.getElementById('friendname2').value).ucfirst();

			if(document.getElementById('friendemail2').value==""){ 
					alert("Please enter friend's e-mail id");
					document.getElementById('friendemail2').focus();
					return false;
				}
				if (document.getElementById('friendemail2').value!="" && !valid_email(document.getElementById('friendemail2').value)){ 
					alert("Please enter friend's e-mail id");
					document.getElementById('friendemail2').focus();
					return false;
				}
				document.getElementById('friendemail2').value = (document.getElementById('friendemail2').value).toLowerCase();	
		
	}
	
		if (document.getElementById('friendemail3').value!="" || document.getElementById('friendname3').value!="" ){ 
				if(!isName(document.getElementById('friendname3'))){ 
					alert("Please enter friend's name");
					document.getElementById('friendname3').focus();
					return false;
				}
				document.getElementById('friendname3').value = (document.getElementById('friendname3').value).ucfirst();

			if(document.getElementById('friendemail3').value==""){ 
					alert("Please enter friend's e-mail id");
					document.getElementById('friendemail3').focus();
					return false;
				}
				if (document.getElementById('friendemail3').value!="" && !valid_email(document.getElementById('friendemail3').value)){ 
					alert("Please enter friend's e-mail id");
					document.getElementById('friendemail3').focus();
					return false;
				}
				document.getElementById('friendemail3').value = (document.getElementById('friendemail3').value).toLowerCase();	
		
	}
	
	if (document.getElementById('youremail').value == document.getElementById('friendemail1').value || document.getElementById('youremail').value == document.getElementById('friendemail2').value || document.getElementById('youremail').value == document.getElementById('friendemail3').value)
	{
	alert("Please enter different e-mail id");
	document.getElementById('youremail').focus();
	return false;
	}
	
	if (document.getElementById('friendemail1').value == document.getElementById('friendemail2').value || document.getElementById('friendemail1').value == document.getElementById('friendemail3').value)
	{
	alert("Please enter different e-mail id");
	document.getElementById('friendemail1').focus();
	return false;
	}
	
	if (document.getElementById('friendemail2').value == document.getElementById('friendemail3').value && document.getElementById('friendemail3').value )
	{
	alert("Please enter different e-mail id");
	document.getElementById('friendemail2').focus();
	return false;
	}
	
}