// switch styles
function setActiveStyleSheet(title) {
  var i, a, main;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}
function getActiveStyleSheet() {
  var i, a;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title") &&
        !a.disabled
        ) return a.getAttribute("title");
  }
  return null;
}
function getPreferredStyleSheet() {
  var i, a;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("rel").indexOf("alt") == -1 &&
        a.getAttribute("title")
        ) return a.getAttribute("title");
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}
window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}
window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

function in_array(needle, haystack) {
	if(typeof needle == 'string') {
		for(var i in haystack) {
			if(haystack[i] == needle) {
					return true;
			}
		}
	}
	return false;
}
/*
function showPopupText(event) {
	if(event.srcElement) o = event.srcElement; else o = event.target;
	if(!o) {
		return;
	}
	MouseX = event.clientX;
	MouseY = event.clientY;
	if(o.alt != null && o.alt != '') {
		o.pop = o.alt;
		o.alt = '';
	}
	if(o.title != null && o.title != '') {
		o.pop = o.title;
		o.title = '';
	}
	if(o.pop != sPop) {
		sPop = o.pop;
		if(sPop == null || sPop == '') {
			$('popLayer').style.visibility = "hidden";
		} else {
			popStyle = o.dyclass != null ? o.dyclass : 'cPopText';
			$('popLayer').style.visibility = "visible";
			showIt();
		}
	}
}

function showIt() {
	$('popLayer').className = popStyle;
	$('popLayer').innerHTML = sPop.replace(/<(.*)>/g,"&lt;$1&gt;").replace(/\n/g,"<br>");
	var popWidth = $('popLayer').clientWidth;
	var popHeight = $('popLayer').clientHeight;
	var popLeftAdjust = MouseX + 12 + popWidth > document.body.clientWidth ? -popWidth - 24 : 0;
	var popTopAdjust = MouseY + 12 + popHeight > document.body.clientHeight ? -popHeight - 24 : 0;
	$('popLayer').style.left = (MouseX + 12 + document.body.scrollLeft + popLeftAdjust) + 'px';
	$('popLayer').style.top = (MouseY + 12 + document.body.scrollTop + popTopAdjust) + 'px';
}

function signature(obj) {
	if(obj.style.maxHeightIE != '') {
		var height = (obj.scrollHeight > parseInt(obj.style.maxHeightIE)) ? obj.style.maxHeightIE : obj.scrollHeight;
		obj.style.maxHeightIE = '';
		return height;
	}
}

if(!document.onmouseover) {
	document.onmouseover = function(e) {
		var event = e ? e : window.event;
		showPopupText(event);
	};
}
*/
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) {
	//var rng = document.body.createTextRange();
	//rng.moveToElementText(obj);
	//rng.scrollIntoView();
	//rng.select();
	//rng.execCommand("Copy");
	//rng.collapse(false);
//}
function copyCode(obj)
{
 	var codestr=obj.value;//即要运行的代码。
	IsCopyed = window.clipboardData.setData('text',codestr)
	if (!IsCopyed)
		alert("没有复制到剪切板")
	else
		alert("已将代码复制到剪贴板")
}
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();
}

var flag=false; 
function DrawImage(ImgD){ 
	var image=new Image(); 
	image.src=ImgD.src; 
	if(image.width>0 && image.height>0){ 
		flag=true; 
		if(image.width>=518){ 
			ImgD.width=518; 
			ImgD.height=(image.height*518)/image.width; 
		}else{ 
			ImgD.width=image.width; 
			ImgD.height=image.height; 
		}  
	} 
} 

function killErrors() {
return true;
}
window.onerror = killErrors;