function checklogin(currentForm){
	
	var user = currentForm.username.value;
	var pass = currentForm.password.value;
	
	if(user == "" && pass == ""){
		//alert('Please Enter Username and Password');
		ShowHideMessage('ErrorMessage');
		return false;
	}else if(user == ""){
		//alert('Please Enter Username');
		ShowHideMessage('ErrorMessage');
		return false;
	}else if(pass == ""){
		//alert('Please Enter Password');
		ShowHideMessage('ErrorMessage');
		return false;
	}

	return true;	
}

function ShowHideMessage(idName){
	var curDiv = document.getElementById(idName);
	
	if(curDiv.className == "divVisible"){
		curDiv.className = "divHidden";
	}else{
		curDiv.className = "divVisible";
	}				
}

function checkEnter(event,thisform){
	if(event.keyCode == 13){
		checklogin(thisform);
	}
}