function strrev(str) {
  return str.split("").reverse().join("");
};


function printpage() {
	window.print();
	return;
};



function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			if (oldonload) {
				oldonload();
			}
		func();
		}
	}
};



function addClass(target, classValue) {
	if (!hasClass(target, classValue)) {
		if (target.className == "") {
			target.className = classValue;
		} else {
			target.className += " " + classValue;
		}
	}
	return true;
};



function removeClass(target, classValue) {
	var removedClass = target.className;
	var pattern = new RegExp("(^| )" + classValue + "( |$)");
	removedClass = removedClass.replace(pattern, "$1");
	removedClass = removedClass.replace(/ $/, "");
	target.className = removedClass;
	return true;
};



function hasClass(target, classValue) {
	var pattern = new RegExp("(^| )" + classValue + "( |$)");
	if (target.className.match(pattern)) {
		return true;
	}
	return false;
};