function newImage( imgSrc ){

 var imgName = new Image();
 imgName.src = imgSrc;

 return imgName;

}

function change( imgName, imgLocation )
{
 document[imgName].src = imgLocation ;
}

var preloadFlag = false;
function loadImages()
{
 if (document.images)
 {
 button1 = newImage("images/01_button_over.jpg")
 button2 = newImage("images/02_button_over.jpg")
 button3 = newImage("images/03_button_over.jpg")
 button4 = newImage("images/04_button_over.jpg")
 button5 = newImage("images/05_button_over.jpg")
 button6 = newimage("images/06_button_over.jpg")
 button7 = newimage("images/07_button_over.jpg")
 input = newImage("images/web_form_submit_over.jpg")
 button_return_over = newImage("images/return_button_over.jpg")
 preloadFlag = true;
 }
}