function GetPageSize() {
	var scrW, scrH;
	if (window.innerHeight && window.scrollMaxY) {
		// Mozilla    
		scrW = window.innerWidth + window.scrollMaxX;
		scrH = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight) {
		// all but IE Mac    
		scrW = document.body.scrollWidth;
		scrH = document.body.scrollHeight;
	} else if (document.body) {
		// IE Mac    
		scrW = document.body.offsetWidth;
		scrH = document.body.offsetHeight;
	}
	var winW, winH;
	if (window.innerHeight) {
		// all except IE    
		winW = window.innerWidth;
		winH = window.innerHeight;
	} else if (document.documentElement
			&& document.documentElement.clientHeight) {
		// IE 6 Strict Mode    
		winW = document.documentElement.clientWidth;
		winH = document.documentElement.clientHeight;
	} else if (document.body) {
		// other    
		winW = document.body.clientWidth;
		winH = document.body.clientHeight;
	}
	// for small pages with total size less then the viewport  
	var pageW = (scrW < winW) ? winW : scrW;
	var pageH = (scrH < winH) ? winH : scrH;
	return {
		PageW : pageW,
		PageH : pageH,
		WinW : winW,
		WinH : winH
	};
}
function initHeight() {
	var _obj_size = GetPageSize();
	var height= (_obj_size.WinH - 80).toString() + 'px';
	$('body').css('height',height);
}