function get_window_dim()
{ var window_dim = new Object();
	if(document.layers)
	{ window_dim.width = window.innerWidth;
	window_dim.height = window.innerHeight; }
	else if(document.getElementById)
	{ window_dim.width = document.body.scrollWidth; 
	window_dim.height = document.body.scrollHeight; }
	else if(document.all)
	{ window_dim.width = document.body.offsetWidth; 
	window_dim.height = document.body.offsetHeight; }
	else { }
	return window_dim; }