if (document.images)
{
  pic1= new Image(115,21); 
  pic1.src="/wp-content/themes/twentyten/images/navButtonRoll.png";
  pic2= new Image(138,63);
  pic2.src="/wp-content/themes/twentyten/images/registerRoll.png";
  pic3= new Image(235,85);
  pic3.src="/wp-content/themes/twentyten/images/downloadRoll.png";
  pic4= new Image(138,63);
  pic4.src="/wp-content/themes/twentyten/images/voteUsRoll.png";
  pic5= new Image(30,29);
  pic5.src="/wp-content/themes/twentyten/images/searchRoll.png";
}