function getObj(name, doc)
{
	if (name == "") return null;
	if (doc==undefined || doc=="")
	{
		return document.getElementById(name);
	}
	else
	{
		return doc.getElementById(name);
	}
}
var userAgent = navigator.userAgent.toLowerCase();
var is_webtv = userAgent.indexOf('webtv') != -1;
var is_kon = userAgent.indexOf('konqueror') != -1;
var is_mac = userAgent.indexOf('mac') != -1;
var is_saf = userAgent.indexOf('applewebkit') != -1 || navigator.vendor == 'Apple Computer, Inc.';
var is_opera = userAgent.indexOf('opera') != -1 && opera.version();
var is_moz = (navigator.product == 'Gecko' && !is_saf) && userAgent.substr(userAgent.indexOf('firefox') + 8, 3);
var is_ns = userAgent.indexOf('compatible') == -1 && userAgent.indexOf('mozilla') != -1 && !is_opera && !is_webtv && !is_saf;
var is_ie = (userAgent.indexOf('msie') != -1 && !is_opera && !is_saf && !is_webtv) && userAgent.substr(userAgent.indexOf('msie') + 5, 3);

function runCode(obj) {
        var winname = window.open('', "_blank", '');
        winname.document.open('text/html', 'replace');
	winname.opener = null // 防止代码对论谈页面修改
        winname.document.write(obj.value);
        winname.document.close();
}
function copycode(obj) {
	if(is_ie && obj.style.display != 'none') {
		var rng = document.body.createTextRange();
		rng.moveToElementText(obj);
		rng.scrollIntoView();
		rng.select();
		rng.execCommand("Copy");
		rng.collapse(false);
	}
}
function saveCode(obj) {
        var winname = window.open('', '_blank', 'top=10000');
        winname.document.open('text/html', 'replace');
        winname.document.write(obj.value);
        winname.document.execCommand('saveas','','code.htm');
        winname.close();
}