Dynamic Drive DHTML Scripts- Reflex tester

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<p>Test your Response time!</p>
Click on "Start" first, and wait until the background color changes. As soon as it changes, hit "stop!"

//Reflext Tester- By Andy Scott (based on script by Jasper van Zandbeek)
//http://www.geocities.com/SiliconValley/Station/4320/
//Submitted to Dynamic Drive for inclusion
//Visit http://www.dynamicdrive.com for this script

var startTime=new Date();
var endTime=new Date();
var startPressed=false;
var bgChangeStarted=false;
var maxWait=20;
var timerID;

var colors=new Array("tomato","chocolate","limegreen","crimson","darkslategray",
"aliceblue","mediumslateblue","cornflowerblue","darkorchid","darkkhaki","coral",
"darkolivegreen","cadetblue")

if (document.all||document.getElementById)
document.write('<div id="reflex" style="width:135px;height:135px;border:1px solid black" onClick="stopTest()"></div>')

function startTest()
{
        if (document.all)
        document.all.reflex.style.backgroundColor=colors[Math.floor(Math.random()*colors.length)];
        else if (document.getElementById)
	document.getElementById("reflex").style.backgroundColor=colors[Math.floor(Math.random()*colors.length)];
        else if (document.layers)
        document.reflexns.document.reflexns_sub.document.bgColor=colors[Math.floor(Math.random()*colors.length)];
	bgChangeStarted=true;
	startTime=new Date();
}

function remark(responseTime)
{
	var responseString="";
	if (responseTime < 0.10)
		responseString="Well done!";
	if (responseTime >= 0.10 && responseTime < 0.20)
		responseString="Nice!";
	if (responseTime >=0.20 && responseTime < 0.30)
		responseString="Could be better...";
	if (responseTime >=0.30 && responseTime < 0.60)
		responseString="Keep practising!";
	if (responseTime >=0.60 && responseTime < 1)
		responseString="Have you been drinking?";
	if (responseTime >=1)
		responseString="Did you fall asleep?";

return responseString;
}

var randMULTIPLIER=0x015a4e35;
var randINCREMENT=1;
var today=new Date();
var randSeed=today.getSeconds();
function randNumber()
{
	randSeed = (randMULTIPLIER * randSeed + randINCREMENT) % (1 << 31);
	return((randSeed >> 15) & 0x7fff) / 32767;
}

<p align="center"><font face="Arial" size="-2">Free DHTML scripts provided by<br>
<a href="http://www.dynamicdrive.com">Dynamic Drive</a></font></p>