//公用
function $ID(id)
{
	return document.getElementById(id);
}
function $Name(name)
{
	return document.getElementsByName(name);
}
function $Tag(tag)
{
	return document.getElementsByTagName(tag);
}



//Tab切换
function H_ShowTab(id, num)
{
	var tab = $ID(id);
	var tabItems = tab.getElementsByTagName("li");
	for(i = 0; i < tabItems.length; i++)
	{
		var tagBody = $ID(id + "Body" + i);
		if(num == i)
		{
			tagBody.style.display = "block";
			tabItems[i].className = "On";
		}
		else
		{
			tagBody.style.display = "none";
			tabItems[i].className = "nomal";
		}
	}
}

//设置字体大小
function SetFontSize(size) 
{ 
	var zoom=document.all?document.all['Zoom']:document.getElementById('Zoom'); 
	zoom.style.fontSize=size+'px'; 
}

//改变样式
function F_ShowSub(num)
{   
	var tabList = document.getElementById("MainNav").getElementsByTagName("li");
	for(i=0; i<tabList.length; i++)
	{
		if (i==num )
		{ 
			tabList[i].className = "On";
			document.getElementById("SubNav"+i).style.display="block";
		}
		else
		{
			tabList[i].className =""; 
			document.getElementById("SubNav"+i).style.display="none";
		}
	} 
}