var numberOfHeaderImages = "28";

function setHeaderImage() {
	var newImageName = "../images/header/title_" + rand(numberOfHeaderImages) + ".jpg";
	document.head_image.src = newImageName;
}

function rand(n) {
	return (Math.floor(Math.random() * n + 1));
}

function setPictures(div_name) {
	var contents = "";
	
	for (i = 1; i < numberOfHeaderImages; i++) {
	    contents = contents + '<img src="../images/header/title_' + i + '.JPG" height="50" width="100" border="0">&nbsp;';
	}
	
	div_name.innerHTML = contents;
}

<!--
/****************************************************
     Author: Eric King
     Url: http://redrival.com/eak/index.shtml
     This script is free to use as long as this info is left in
     Featured on Dynamic Drive script library (http://www.dynamicdrive.com)
****************************************************/
var win=null;
function NewWindow(mypage,myname,w,h,scroll,pos){
if(pos=="random"){LeftPosition=(screen.width)?Math.floor(Math.random()*(screen.width-w)):100;TopPosition=(screen.height)?Math.floor(Math.random()*((screen.height-h)-75)):100;}
if(pos=="center"){LeftPosition=(screen.width)?(screen.width-w)/2:100;TopPosition=(screen.height)?(screen.height-h)/2:100;}
else if((pos!="center" && pos!="random") || pos==null){LeftPosition=0;TopPosition=20}
settings='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
win=window.open(mypage,myname,settings);}
// -->