function preLoad() {
  for (i=1; i<=6; i++) {
    count = Math.random()*1000000000000000000000;
    eval('image'+count+' = new Image()');
    eval('image'+count+'.src = "images/promark_menu_0'+i+'.gif"');
  }
  for (i=1; i<=6; i++) {
    count = Math.random()*1000000000000000000000;
    eval('image'+count+' = new Image()');
    eval('image'+count+'.src = "images/promark_menu_0'+i+'_over.gif"');
  }
}

function imgOn(imgName) 
{
	 if (document.images)
	 {document[imgName].src = ("images/" + imgName + "_over.gif");}
}

function imgOff(imgName) 
{
	 if (document.images)
	 {document[imgName].src = ("images/" + imgName + ".gif");}
}