var nMax = 10; //<-- total number of images
var nMin = 0;
var nSize = (nMax.toString(10)).length;

function sum(num){
	var i=0, nSum = 0, sSum = '', sDigit = '', sNum = '', nLen = 0;
	nSum = parseInt(num,10);
	while (nSum > nMax){
		sSum = nSum.toString(10);
		nLen = sSum.length;
		nSum = 0;
		for(i=0; i<nLen; i++){
			sDigit = sSum.substring(i,i+1);
			if (sDigit != ".") {
				nSum = nSum + parseInt(sDigit, 10);
			}
		}
	}
	return nSum;
}

function rnd(){
	var rNum = Math.random() * Math.pow(10,nSize);
	var sNum = '', nSum = 0; 
	if (rNum > nMax){rNum = (nMax * rNum) + 1};
	nSum = sum((rNum.toString(10)).substring(0,nSize));
	return nSum.toString(10);
}

function getRandomNumber(){
	//document.write(rnd());
	return rnd();
}

function getImage(){
	document.write("<img src='images/" + "myimage_" + rnd(0,10,2) +
	".gif' alt='' border=0>");
	//document.write("myimage_" + rnd() + ".gif");
}