function check(username,password){
	if(username=="" && password=="")
		{
			window.alert("Please enter your Username & Password");
		}
	else if(username=="")
		{
			window.alert("Please enter your Username");
		}
	else if(password=="")
		{
			window.alert("Please enter your Password");
		}

	else{

		}
	}
 };