var pth = "images/";
var imgOut = new Array();
var imgOver = new Array();var imgArray = new Array('a', 'c', 'c2', 'c3', 'n', 'p', 'c4', 'a2', 'a3');
if(document.images){
	for(var i=0;i<imgArray.length;i++){
		imgOut[i] = new Image; 
		imgOut[i].src = pth + imgArray[i] + "_off.gif"; 
		imgOver[i] = new Image; 
		imgOver[i].src = pth + imgArray[i] + "_on.gif"; 
	}
}

function rollOut(i){ 
	document.images[imgArray[i]].src = imgOut[i].src; 
} 

function rollOver(i){ 
	document.images[imgArray[i]].src = imgOver[i].src; 
}