// JavaScript Document

rnd.today=new Date();
rnd.seed=rnd.today.getTime();

function rnd() {
	rnd.seed = (rnd.seed*9301+49297) % 233280;
	
	return rnd.seed/(233280.0); }

function rand(number) {
	var result = Math.ceil(rnd()*number);
	if (!result)result++;
	
  return result; }

function rotateHeader(){
	var ad_cnt1 = 4;
	var ad1 = rand(ad_cnt1);
	var link1, adBanner1, width1, height1;
	
	switch(ad1){
		case 1:
			adBanner1="images/header_clicklock.jpg";
			width1="800";
			height1="100";
			alt1="";
			break;
		case 2:
			adBanner1="images/header_cms.jpg";
			width1="800";
			height1="100";
			alt1="";
			break;
		case 3:
			adBanner1="images/header_oxford.jpg";
			width1="800";
			height1="100";
			alt1="";
			break;
		case 4:
			adBanner1="images/header_rustic.jpg";
			width1="800";
			height1="100";
			alt1="";
			break;
	}
	
	document.getElementById('headerImage').innerHTML = '<img src="' + adBanner1 + '" width=' + width1 + ' height=' + height1 + ' border=0 alt="' + alt1 + '">';
}