function chImage(url, obj_id) {
    var i;
    i = document.getElementById(obj_id);
    i.src = url;
}

function openUp(url,name,width,height,scrollbars,toolbar,status,location) {
	thirdParameter = 'width=' + width + ',height=' + height + ',scrollbars=' + scrollbars + ',toolbar=' + toolbar + ',status=' + status + ',location=' + location + ',menubar=no';
	openUpObj = window.open(url,name,thirdParameter);
	openUpObj.focus();
    return false;
}

function chImg(img_name) {
    var i;
    i = document.getElementById('car_foto');
    i.src = img_name;
}