function random_imglink(){
var myimages=new Array()
//specify random images below. You can have as many as you wish
myimages[1]="portfolio/portfolio001_small.gif"
myimages[2]="portfolio/portfolio002_small.gif"
myimages[3]="portfolio/portfolio003_small.gif"

//specify corresponding links below
var imagelinks=new Array()
imagelinks[1]="portfolio/portfolio001_large.gif"
imagelinks[2]="portfolio/portfolio002_large.gif"
imagelinks[3]="portfolio/portfolio003_large.gif"

var ry=Math.floor(Math.random()*myimages.length)
if (ry==0)
ry=1
document.write('<a href='+'"'+imagelinks[ry]+'"'+' target="_blank" ><img src="'+myimages[ry]+'" border=0></a>')
}
random_imglink()