//<![CDATA[
var imagesA=new Array();
imagesA[0]="images/dd.gif";
imagesA[1]="images/dd2.gif";
var imagesB=new Array();
imagesB[0]="images/dd3.png";
imagesB[1]="images/dd4.gif";

function randomimage() {
images=imagesB.concat(imagesA,imagesB);
//u have a new array what consist all 4 images array.
var i=Math.floor(Math.random()*images.length);
document.write("<img src='"+images[i]+"' />");
}

var images1=new Array();
images1[0]="quotes/q1.jpg";
images1[1]="quotes/q2.jpg";
var images2=new Array();
images2[0]="quotes/q1.jpg";
images2[1]="quotes/q3.jpg";

function randomimage2() {
images=images2.concat(images1,images2);
//u have a new array what consist all 4 images array.
var i=Math.floor(Math.random()*images.length);
document.write("<img src='"+images[i]+"' />");
}