function wopen(url, w, h)
{
        // Fudge factors for window decoration space.
	// In my tests these work well on all platforms & browsers.
        w += 26;
        h += 46;
	var win = window.open(url,
		'popup', 
		'width=' + w + ', height=' + h + ', ' +
		'location=no, menubar=no, ' +
		'status=no, toolbar=no, scrollbars=no, resizable=yes');
	//win.resizeTo(w, h);
	win.focus();
}

at_out = new Image();
at_out.src = "images/firmaAtip_web_vert2.jpg";
at_over = new Image();
at_over.src = "images/firmaAtip_web_vert1.jpg";

function btn_out()
{
	document.getElementById('at_img').src = at_out.src;
}

function btn_over()
{
	document.getElementById('at_img').src = at_over.src;
}

function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}