function preloadImages()
{
     // counter
     var i = 0;

     // create object
     imageObj = new Image();

     // set image list
     images = new Array();
     images[0]="home.gif";
     images[1]="corporate_on.gif";
     images[2]="corporate_selected.gif";
     images[3]="products_on.gif";
     images[4]="products_selected.gif";
     images[5]="support_on.gif";
     images[6]="support_selected.gif";
     images[7]="news_on.gif";
     images[8]="news_selected.gif";
     images[9]="sitemap_on.gif";
     images[10]="sitemap_selected.gif";
     images[11]="developers_on.gif";
     images[12]="developers_selected.gif";
     // start preloading
     for(i=0; i<=12; i++)
     {
          imageObj.src=images[i];
     }
}