function login_check() {
	var d = document.login;  
	
 	if(d.email.value ==0) {
		alert ("Please enter a valid E-mail addresd.\n" +"Example: name@gmail.com");
		d.email.focus()
		return false;
	} else if(d.email.value.indexOf("@")<1 ||
    	d.email.value.indexOf(".")==-1 ||
    	d.email.value.indexOf(",")!=-1 ||
    	d.email.value.indexOf(" ")!=-1 ||
    	d.email.value.length<6)
  {
    alert("Please enter a valid E-mail addresd.\n" +
    "Example: name@gmail.com");
     d.email.focus();
     return false;
  }
 
  if(d.pass.value == 0) {
		alert ("Please enter your password!");
		d.pass.focus()
		return false;
	} 
	return true;
}