//DOM简化函数
function $(id)
{
	return document.getElementById(id);
}

//表单获取光标函数
function getfocus(obj)
{
	obj.focus();
}

//XMLHTTP对象创建函数
function inixmlhttp()
{
	var _xmlhttp;
	try{
		_xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch(e)
	{
		try{
			_xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		}catch(e)
		{
			_xmlhttp = false;
		}
	}
	if(!_xmlhttp && typeof XMLHttpRequest != 'underfined')
	{
		try{
			_xmlhttp = new XMLHttpRequest();
		}catch(e)
		{
			_xmlhttp = false;
		}
	}
	if(!_xmlhttp && window.createRequest){
		try{
			_xmlhttp = window.createRequest();
		}catch(e){
			_xmlhttp = false;
		}
	}
	return _xmlhttp;
}

function isemail(email)
{
	if(email.indexOf("@") == -1 || email.indexOf(".") == -1)
	{
		return -1;
	}
	else
	{
		return 1;
	}
}

//added by Steven
function changeTab(obj,objbg,tab1,tab2)
{
	$(obj).style.backgroundImage = objbg;
	$(tab1).style.display = 'block';
	$(tab2).style.display = 'none';
}
//added by Jim
//bbs index page
function changeTabBbs(tab1,tab2)
{
	$(tab1).style.display = 'block';
	$(tab2).style.display = 'none';
}
//today or this week
function changeTabTodayThisweek(tab1,tab2,tab3)
{
	$(tab1).style.display = 'block';
	$(tab2).style.display = 'none';
	$(tab3).style.display = 'none';
}
//end
function MM_preloadImages() { //v3.0
	var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
	var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function submitSearch(theform) {
	var keyword  = document.getElementById('q');
	var elForm =theform;

	if (document.getElementById('q').value == '输入您要查询关键字...'   			
		|| keyword == null || keyword.value == "")
	{
		alert("请输入你要查找的关键字!");
		return false;
	}
    elForm.submit();

}

function submitSearchSellinfo(theform) {
	var keyword  = document.getElementById('q');
	var elForm =theform;

	if (document.getElementById('q').value == '请输入你需要的产品名称、型号...' ||document.getElementById('q').value == '请输入你需要的产品名称、型号...'  			
		|| keyword == null || keyword.value == "")
	{
		alert("请输入您要查找的产品名称或型号!");
		return false;
	}
    elForm.submit();

}

function submitSearchCompany(theform) {
	var keyword  = document.getElementById('q');
	var elForm =theform;

	if (document.getElementById('q').value == '请输入公司名称、主要产品...' 
		|| keyword == null || keyword.value == "")
	{
		alert("请输入公司名称或主要产品!");
		return false;
	}
    elForm.submit();

}

function on(obj) 
{ 
var str=document.getElementById(obj).value; 
if(str=="输入您要查询关键字..." ||str=="请输入你需要的产品名称、型号..." ||str=="请输入公司名称、主要产品...")  //如果是默认值的时候才清除,否则保留 
  { 
      document.getElementById(obj).value=""; 
  } 
} 
function go(obj) 
{ 
  var str=document.getElementById(obj).value; 
  if(str=="")  //当文本框内的值为空的时候,再还原成默认值 
  { 
      document.getElementById(obj).value="输入您要查询关键字..."; 
  } 
} 

function goSellinfo(obj) 
{ 
  var str=document.getElementById(obj).value; 
  if(str=="")  //当文本框内的值为空的时候,再还原成默认值 
  { 
      document.getElementById(obj).value="请输入你需要的产品名称、型号..."; 
  } 
} 

function goCompany(obj) 
{ 
  var str=document.getElementById(obj).value; 
  if(str=="")  //当文本框内的值为空的时候,再还原成默认值 
  { 
      document.getElementById(obj).value="请输入公司名称、主要产品..."; 
  } 
} 

function CheckBrowser(){
    var cb = "Unknown";
    if(window.ActiveXObject){
        cb = "IE";
    }else if(navigator.userAgent.toLowerCase().indexOf("firefox") != -1){
        cb = "Firefox";
    }else if((typeof document.implementation != "undefined") && (typeof document.implementation.createDocument != "undefined") && (typeof HTMLDocument != "undefined")){
        cb = "Mozilla";
    }else if(navigator.userAgent.toLowerCase().indexOf("opera") != -1){
        cb = "Opera";
    }
    return cb;
}