// PageSearch.js
<!-- this script got from www.javascriptfreecode.com coded by: Krishna Eydatoula-->
var NS4 = (document.layers);    
var IE4 = (document.all);
var win = window;    
var n   = 0;
function findInPage(str) {
	var txt, i, found;
	if (str == "")
		return false;
	if (NS4) {
		if (!win.find(str))
			while(win.find(str, false, true))
				n++;
		else
			n++;
		if (n == 0)
			alert("Not found.");
	}
	if (IE4) {
		txt = win.document.body.createTextRange();
		for (i = 0; i <= n && (found = txt.findText(str)) != false; i++) {
			txt.moveStart("character", 1);
			txt.moveEnd("textedit");
		}
		if (found) {
			txt.moveStart("character", -1);
			txt.findText(str);
			txt.select();
			txt.scrollIntoView();
			n++;
		}
		else {
			if (n > 0) {
				n = 0;
				findInPage(str);
			}
			else
				alert("Xin loi, khong thay tu ban tim. Thu lai voi CHU CO DAU ban nhe! Sorry, we couldn't find. Try again");
	 }
	}
	return false;
}
<!-- /Search-->