function checkscript() {
	if (some value is/is not something) {
		
		alert('alert user of problem');
		return false;
	}
	else if (another value is/is not something) {
		
		alert('alert user of problem');
		return false;
	}


	return true;
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_regbutton = newImage('images/regbutton.jpg');
		preloadFlag = true;
	}
}