function checkLogin(f){
	var f=document.getElementById(f);
	var username=f.username.value;
	var password=f.password.value;
	
	var filled=false;
	var errors=false;
	var errorM="The following fields are required\n in order to login:\n\n";
	
	if(username==""){ errors=true; errorM += " - Username.\n"; }
	if(password==""){ errors=true; errorM += " - Password.\n"; }
	
	if(errors){
		alert(errorM);
		return false;
		}
	else {
		return true;
		}
	}