var fishImages = new Array("1.jpg","2.jpg","3.jpg","4.jpg","5.jpg","6.jpg","7.jpg","8.jpg","9.jpg","10.jpg","11.jpg","12.jpg","13.jpg","14.jpg","15.jpg");
var whichImage= Math.round((Math.random()*100)/(15/fishImages.length-1));
while(whichImage>fishImages.length-1){
whichImage= Math.round((Math.random()*100)/(15/fishImages.length));
}
document.write("<img src='images/page/pic" + fishImages[whichImage] + "'width=414 height=92 border='0' alt='Welcome to The Tropical Fish Shop'>");