var myimg=new Array()
function preloadimages(){
for (i=0;i<preloadimages.arguments.length;i++){
myimg[i]=new Image()
myimg[i].src=preloadimages.arguments[i]
}
}
preloadimages("/images/topnav/bt1_learn_over.gif","/images/topnav/bt2_community_over.gif","/images/topnav/bt3_edu_over.gif","/images/topnav/bt4_clinical_over.gif","/images/topnav/bb1_visit_over.gif","/images/topnav/bb2_join_over.gif","/images/topnav/bb3_become_over.gif","/images/topnav/bb4_contact_over.gif");