picArray = new Array();
picArray[0] = new Object();
picArray[1] = new Object();
picArray[2] = new Object(); /* add additional list item */

picArray[0]['url'] = "/images/WDP-HomeBanners01.jpg";
picArray[0]['alt'] = "Scientific collaboration collage";
picArray[0]['width'] = "590px";
picArray[0]['height'] = "100px";

picArray[1]['url'] = "/images/WDP-HomeBanners02.jpg";
picArray[1]['alt'] = "Scientific collaboration collage";
picArray[1]['width'] = "590px";
picArray[1]['height'] = "100px";

picArray[2]['url'] = "/images/WDP-HomeBanners03.jpg";
picArray[2]['alt'] = "Scientific collaboration collage";
picArray[2]['width'] = "590px";
picArray[2]['height'] = "100px";



function writeImage() { // write an image from above into the webpage

	var howMany  = 3;   // change this number according to how many images are listed above
	
	var whichNum = Math.floor(Math.random()*howMany) // choose random image number

	document.write('<img class="homepage_image" ' +
										'src="'    + picArray[whichNum]["url"] + '"' + 
										'alt="'    + picArray[whichNum]["alt"] + '" ' +
										'title="'  + picArray[whichNum]["alt"] + '" ' +
										'width="'  + picArray[whichNum]["width"] + '" ' +
										'height="' + picArray[whichNum]["height"] + '" />');
}