function swapimage() { 
theimages = new Array("images/FLOAT_Image1.jpg",
"images/FLOAT_Image2.jpg",
"images/FLOAT_Image3.jpg",
"images/FLOAT_Image4.jpg",
"images/FLOAT_Image5.jpg",
"images/FLOAT_Image6.jpg",
"images/FLOAT_Image7.jpg"); 
whichimage = Math.floor(Math.random()*theimages.length); 
document.write('<img src="' +theimages[whichimage]+ '" alt="">'); 

}