/**
 * http://simon.incutio.com/ written by Simon Willison
 */
function addLoadEvent(func){
	var prev_onload = window.onload;
	// ¾ÆÁ÷ onload event¿¡ ÇÔ¼ö°¡ Ãß°¡ µÇÁö ¾Ê¾ÒÀ¸¸é ÇÔ¼öÈ£Ãâ
	// cf: È£ÃâµÇÁö ¾ÊÀº°æ¿ì IE: object, FF : undefined
	if (typeof window.onload != 'function'){
		window.onload = func;
	// ÀÌ¹Ì onload event¿¡ ÇÔ¼ö°¡ Ãß°¡µÇ¾î ÀÖÀ¸¸é Ãß°¡·Î È£Ãâ
	} else {
		window.onload = function(){
			prev_onload();
			func();
		}
	}
}

function getObject(objectId) {
	if ( document.getElementById && document.getElementById(objectId) ) {
		return document.getElementById(objectId);  // W3C DOM return
	} else if ( document.all && document.all[objectId] ) {
		return document.all(objectId);	// IE4
	} else if ( document.layers && document.layers[objectId] ) {
		return document.layers[objectId];	// NN4
	} else {
		return false;
	}
}