function chk_email()
{

if (document.log_in.email.value=="")
        {
           alert ("Your Email ID please!");
           document.log_in.email.select(); 
           return false;
	    }  
		
		
				if ((document.log_in.email.value).indexOf(" ")>=0)
		{
		alert ("Blank space not allowed inside email!");
		document.log_in.email.select();
		return false;
		}
	
		if (document.log_in.email.value.indexOf("@",1) == -1)
		{
			alert("Invalid E-Mail address");
			document.log_in.email.focus();
			document.log_in.email.select();
			return(false);
		}
		if (document.log_in.email.value.indexOf("@") == 0)
		{
			alert("Invalid E-Mail address");
			document.log_in.email.focus();
			document.log_in.email.select();
			return(false);
		}
		if (document.log_in.email.value.indexOf(".",5) == -1)
		{
			alert("Invalid E-Mail address");
			document.log_in.email.focus();
			document.log_in.email.select();
			return(false);
		}
	}