//用于取得元素可操作的ID
function GetObj(objID)
{
	if(document.getElementById)
	{
		return eval('document.getElementById("' + objID + '")');
	}
	else
	{
		if(document.layers)
		{
			return eval("document.layers['" + objID + "']");
		}
		else
		{
			return eval('document.all.' + objID);
		}
	}
}

function SetCookie(cookieName, cookieData) {
    var expires = new Date ();
    expires.setTime(expires.getTime() + 31 * (24 * 60 * 60 * 1000));
    document.cookie = cookieName + "=" + escape(cookieData) + "; expires=" + expires.toGMTString();
} 

function GetCookie(name) {
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1)
    {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    }
    else
    {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1)
    {
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}