function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ) {	el.style.display = 'block';}
	else {
	    el.style.display = 'none';
	}
}
function blanket_size(popUpDivVar) {
	if (typeof window.innerWidth != 'undefined') {
		viewportheight = window.innerHeight;
	} else {
		viewportheight = document.documentElement.clientHeight;
	}
	if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
		blanket_height = viewportheight;
	} else {
		if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
			blanket_height = document.body.parentNode.clientHeight;
		} else {
			blanket_height = document.body.parentNode.scrollHeight;
		}
	}
	var blanket = document.getElementById('blanket');
	blanket.style.height =  '200px';
	//blanket.style.height = blanket_height + 'px';
	var popUpDiv = document.getElementById(popUpDivVar);
	popUpDiv_height=150;//150 is half popup's height
	popUpDiv.style.top = 295 + 'px';
	popUpDiv.style.height='200px';
	//popUpDiv_height=blanket_height/2-200;//150 is half popup's height
	//popUpDiv.style.top = popUpDiv_height + 'px';
}
function window_pos(popUpDivVar) {
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerHeight;
	} else {
		viewportwidth = document.documentElement.clientHeight;
	}
	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		window_width = viewportwidth;
	} else {
		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			window_width = document.body.parentNode.clientWidth;
		} else {
			window_width = document.body.parentNode.scrollWidth;
		}
	}
	var popUpDiv = document.getElementById(popUpDivVar);
	window_width=20;//150 is half popup's width
	popUpDiv.style.left = window_width + 'px';
	//window_width=window_width/2-200;//150 is half popup's width
	//popUpDiv.style.left = window_width + 'px';
}
function popup(windowname) {
	blanket_size(windowname);
	window_pos(windowname);
	toggle('blanket');
	toggle(windowname);		
}

function addCookie(name,value,expireDays){ 
    var cookieString=name+"="+escape(value); 
    //判断是否设置过期时间 
    if(expireDays>0){ 
    var date=new Date(); 
   
    date.setTime(date.getTime()+expireDays*24*3600*1000); 
    cookieString=cookieString+"; expires="+date.toGMTString(); 
    
    } 
    document.cookie=cookieString; 
} 

function getCookie(name){ 
    var strCookie=document.cookie; 
    var arrCookie=strCookie.split("; "); 
    for(var i=0;i<arrCookie.length;i++){ 
    var arr=arrCookie[i].split("="); 
    if(arr[0]==name)
        return arr[1]; 
    } 
    return ""; 
} 

function deleteCookie(name){ 
var date=new Date(); 
date.setTime(date.getTime()-10000); 
document.cookie=name+"=v; expires="+date.toGMTString(); 
}