function validate(required)
{
	var ok = true;
	var r  = required.split(',');
	var m  = "";
	for(i=0; i < r.length; i++)
	{
		var thisR = $(r[i]);
		if(thisR.value == '')
		{
			ok = false;
			if(m != ''){ m += ", "; }
			m += r[i].replace(/_/g," ");
		}
	}
	if(ok)
	{
		return true;
	}
	else
	{
		alert("The following fields are required: "+m);
		return false;
	}
}