normal_Enter = new Image();
normal_Enter.src = "http://www.synergeez.com/images/v2/buttonEnter.jpg";

mouseover_Enter = new Image();
mouseover_Enter.src = "http://www.synergeez.com/images/v2/buttonEnterON.jpg";

function swap(){
if (document.images){
for (var x=0;
x<swap.arguments.length;
x+=2) {
document[swap.arguments[x]].src = eval(swap.arguments[x+1] + ".src");
}
}
}