var popup_layer = new Object();

function showBackground(bg_id) {

var bg_name       = bg_id ? bg_id:'bg_trans';
var _windowheight = window.innerHeight; 
var _scrollheight = document.body.parentNode.scrollHeight;
var _finalHeight  = (_scrollheight<_windowheight) ? _windowheight:_scrollheight;
var _windowwidth  = window.innerWidth; 
var _scrollwidth  = document.body.parentNode.scrollWidth;
var _finalWidth   = (_scrollwidth<_windowwidth) ? _windowwidth:_scrollwidth;
document.getElementById(bg_name).style.height  = _finalHeight+'px';
document.getElementById(bg_name).style.width   = _finalWidth+'px';
document.getElementById(bg_name).style.display = 'block';
}

function hideBackground(bg_id) {

var bg_name       = bg_id ? bg_id:'bg_trans';
document.getElementById(bg_name).style.display = 'none';
}


function check_keycode(e) {

var keycode;
if (e==null) {
    //ie
    keycode = event.keyCode;
    }
else {
    //mozilla
    keycode = e.which;
    }

if(keycode == 27) {
	if (typeof(document.OnKeyUp_ESC)=="function") {
    	document.OnKeyUp_ESC();
    	}
    document.onkeyup = null;
    }
}