if (document.images) {
 var SecurityUp = new Image();
  SecurityUp.src = "../images/dellNavSecurityUp.gif";

 var SecurityOver = new Image();
  SecurityOver.src = "../images/dellNavSecurityOver.gif";

  var LaptopUp = new Image();
 LaptopUp.src = "../images/dellNotebookUp.gif";
 
   var LaptopOver = new Image();
 LaptopOver.src = "../images/dellNotebookOver.gif";

  var CasesUp = new Image();
  CasesUp.src = "../images/dellNavCaseUp.gif";

  var CasesOver = new Image();
  CasesOver.src = "../images/dellNavCaseOver.gif";

  var FlatUp = new Image();
  FlatUp.src = "../images/dellNavFlatUp.gif";

  var FlatOver = new Image();
  FlatOver.src = "../images/dellNavFlatOver.gif";
	
	var MiceUp = new Image();
  MiceUp.src = "../images/dellNavMiceUp.gif";

  var MiceOver = new Image();
  MiceOver.src = "../images/dellNavMiceOver.gif";

  var WorkUp = new Image();
  WorkUp.src = "../images/dellNavWorkUp.gif";

  var WorkOver = new Image();
  WorkOver.src = "../images/dellNavWorkOver.gif";

}
function imgUp(imgName) {
  if (document.images) {
    document[imgName].src = eval(imgName + "Up").src;
  }
}

function imgOver(imgName) {
  if (document.images) {
    document[imgName].src = eval(imgName + "Over").src;
  }
}