//Validate forms

// Checks to see if form element is empty 
function isEmpty(val){
	if (val.match(/^s+$/) || val == ""){
		return true;
	}
	else{
		return false;
	} 
}


function checkSinin(f){
	if(isEmpty(f.user.value)){
		alert("ERROR: username is empty.");	
		return false;
	}
	if(isEmpty(f.pass.value)){
		alert("ERROR: password is empty.");			   
		return false;
	}
	return true;
}