imageover = new Array(4);
for(i = 0; i < 4; i++){imageover[i] = new Image();}
imageover[0].src = "common/images/btns/home_on.gif";
imageover[1].src = "common/images/btns/services_on.gif";
imageover[2].src = "common/images/btns/about_on.gif";
imageover[3].src = "common/images/btns/contact_on.gif";

function MOver(i,o) { tempPic=document.images[o].src;document.images[o].src=imageover[i].src; }
function MOut(o)    { document.images[o].src=tempPic; }