var arrImages = new Array(8);
arrImages[0] = "mnu_home2.gif";
arrImages[1] = "mnu_grouphealth2.gif";
arrImages[2] = "mnu_indhealth2.gif";
arrImages[3] = "mnu_indlife2.gif";
arrImages[4] = "mnu_staff2.gif";
arrImages[5] = "mnu_contact2.gif";
arrImages[6] = "mnu_insurance_providers2.gif";
arrImages[7] = "mnu_service_area2.gif";
for (i=0; i < arrImages.length; i++) 
{
 var preload = new Image();
 preload.src = arrImages[i];
}
function SwapImg(objId,strImg)
{
 document.getElementById(objId).src = "images/" + strImg;	
}