//IE6下显示PNG格式
function returnPng()
{	
	return ".logo, img, .nav, .home, .home_selected, .product, .download, .demo, .sell, .agent, .help, .help_selected, .middle, .download_exe, .list_new_icon, .list_icon, .qq_box, .png_image, .submit_bu, .upgrade_icon, .download_bu, .play_bu, .menu_title, .agent_sumbit_bu, .download_button_icon_grey, .download_button_icon, .agent_sumbit_bu_g, .helpBu1";
}

function GetXmlHttpObject()
{
	var xmlHttp=null;
	try
	{
	// Firefox, Opera 8.0+, Safari
	xmlHttp=new XMLHttpRequest();
	}
	catch(e)
	{
	// Internet Explorer
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e)
		{
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}

function requestPatameter(paras)
{ 
	var url = location.href; 
	var paraString = url.substring(url.indexOf("?")+1,url.length).split("&"); 
	var paraObj = {} 
	for (i=0; j=paraString[i]; i++)
	{ 
		paraObj[j.substring(0,j.indexOf("=")).toLowerCase()] = j.substring(j.indexOf("=")+1,j.length); 
	} 
	var returnValue = paraObj[paras.toLowerCase()]; 
	if(typeof(returnValue)=="undefined")
	{ 
		return ""; 
	}
	else
	{ 
		return returnValue; 
	} 
}