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_over = newImage("images/optimized/button_lead_generation.png")
 button2_over = newImage("images/optimized/button_app_setting.png")
 button3_over = newImage("images/optimized/button_sales_force.png")
 button_form_over = newImage("images/optimized/web_form_submit.png")
 button_return_over = newImage("images/optimized/thankyou/button_return_over.png")
 infoform = newimage("images/optimized/contact/infoform_button_over.png")
 button_business_over = newImage("images/optimized/button_business_over.png")
 
 preloadFlag = true;
 }
}