// JavaScript Document

var swap_out = new Array();
var swap_over = new Array();
var swap_elements;
	
function swapInit() {
	
	swap_elements = document.getElementsByName("btn");

	for(var i = 0; i < swap_elements.length; i++){
	// preload Out-Image
		swap_out[i] = new Image();
    	swap_out[i].src = swap_elements[i].src;
	// preload Over-Image
		tmp_src = swap_out[i].src.replace(/1\./,"2.");
		swap_over[i] = new Image();
		swap_over[i].src = tmp_src;
	// Evenlistener für alle Buttons	
		swap_elements[i].onmouseover = new Function("swapImg("+i+")");
		swap_elements[i].onmouseout = new Function("swapImg("+i+")");
	}
}

function swapImg(i){
	if(swap_elements[i].src == swap_out[i].src)
		swap_elements[i].src = swap_over[i].src;
	else
		swap_elements[i].src = swap_out[i].src;
}