function loadimg(){
	ON = new Array();
	ON[0]=new Image();ON[0].src='./images/menu1a.gif';
	ON[1]=new Image();ON[1].src='./images/menu2a.gif';
	ON[2]=new Image();ON[2].src='./images/menu3a.gif';
	ON[3]=new Image();ON[3].src='./images/menu4a.gif';
}
function over(n){
	document.images[n].src='./images/'+n+'a.gif';
}
function out(n){
	document.images[n].src='./images/'+n+'.gif';
}