bannerpics=new Array; 

bannerpics[1]="dpm8.jpg"; 

bannerpics[2]="dpm9.jpg"; 

bannerpics[3]="dpm10.jpg";

bannerpics[4]="dpm11.jpg"; 

function ShowBanner() {

num = Math.random();
num = 1 + ( num * ((bannerpics.length - 1)-1));
num = Math.round(num);

document.write("<div>");
document.write("<img src='" + bannerpics[num] + "' border='1'>");
document.write("</div>");
}