jQuery.preloadImages = function()
{
  for(var i = 0; i<arguments.length; i++)
  {
    jQuery("<img>").attr("src", arguments[i]);
  }
}

$.preloadImages("../commercial/i/com1.jpg", 
"../commercial/i/com2.jpg", 
"../commercial/i/com3.jpg", 
"../commercial/i/com4.jpg", 
"../commercial/i/com5.jpg", 
"../commercial/i/com6.jpg", 
"../commercial/i/com7.jpg", 
"../commercial/i/com8.jpg", 
"../commercial/i/com9.jpg", 
"../commercial/i/com10.jpg", 
"../commercial/i/com11.jpg", 
"../commercial/i/com12.jpg", 
"../commercial/i/com13.jpg", 
"../commercial/i/com14.jpg", 
"../commercial/i/com15.jpg", 
"../commercial/i/com16.jpg", 
"../commercial/i/com17.jpg", 
"../commercial/i/com18.jpg", 
"../commercial/i/com19.jpg", 
"../commercial/i/com20.jpg");