/*
 *Add Support for document.getElementById for older IE version.
*/
if(document.all && !document.getElementById) {
    document.getElementById = function(id) {
         return document.all[id];
    }
}

function check(field, checked) {
    if (field == null) {
        return;
    }

    if (field.type == "checkbox") {
        field.checked = checked;
    } else {
        for (i = 0; i < field.length; i++) {
            field[i].checked = checked;
        }
    }
}

function preload_images() {
		var preloaded = new Array();
		
		for (var i = 0; i < arguments.length; i++) {
			preloaded[i] = document.createElement('img');
			preloaded[i].setAttribute('src',arguments[i]);
		};
}

function update_img(imgId, newUrl, newWidth, newHeight) {
	var img = document.getElementById(imgId);
	img.src = newUrl;
	img.width = newWidth;
	img.height = newHeight;
}