function nav(){
var sTitle, aryTitle
sTitle = document.title
aryTitle = sTitle.split("-")
var oTD = document.getElementById("item")
var oNav1 = document.getElementById("zjcar")
var oNav2 = document.getElementById("trend")
var oNav3 = document.getElementById("product")
var oNav4 = document.getElementById("culture")

if(aryTitle[1] == "《防雷杂志》"){
	oNav1.className = "clmnav_lt"
	oTD.innerHTML = "<table width='10%' border='0' cellspacing='0' cellpadding='0' class='banner' align='center'><tr><td class='clmnav' onmouseover='chgClass(this)' onmouseout='retClass(this)'><div style='cursor:hand' onclick=window.location='/column_inc/lpmaga.asp'>技术论坛</div></td></tr></table>"
	}

if(aryTitle[1] == "行业动态"){
	oNav2.className = "clmnav_lt"
	oTD.innerHTML = "<table width='40%' border='0' cellspacing='0' cellpadding='0' class='banner' align='center'><tr><td class='clmnav' onmouseover='chgClass(this)' onmouseout='retClass(this)'><div style='cursor:hand' onclick=window.location='/column_inc/lpexhi.asp'>展会信息</div></td><td class='clmnav' onmouseover='chgClass(this)' onmouseout='retClass(this)'><div style='cursor:hand' onclick=window.location='/column_inc/lpnews.asp'>行业新闻</div></td><td class='clmnav' onmouseover='chgClass(this)' onmouseout='retClass(this)'><div style='cursor:hand' onclick=window.location='/column_inc/lplaw.asp'>政策法规</div></td></tr></table>"
	}

if(aryTitle[1] == "产品&技术"){
	oNav3.className = "clmnav_lt"
	oTD.innerHTML = "<table width='10%' border='0' cellspacing='0' cellpadding='0' class='banner' align='center'><tr><td class='clmnav' onmouseover='chgClass(this)' onmouseout='retClass(this)'><div style='cursor:hand' onclick=window.location='/column_inc/lpproducts.asp'>防雷产品</div></td></tr></table>"
	}

if(aryTitle[1] == "企业名录"){
	oNav4.className = "clmnav_lt"
	oTD.innerHTML = " <table width='50%' border='0' cellspacing='0' cellpadding='0' class='banner' align='center'><tr><td class='clmnav' onmouseover='chgClass(this)' onmouseout='retClass(this)'><div style='cursor:hand' onclick=window.location='/enterprise/lpview.asp'>信息查看</div></td><td class='clmnav' onmouseover='chgClass(this)' onmouseout='retClass(this)'><div style='cursor:hand' onclick=window.location='/enterprise/lprel1.asp'>信息发布</div></td><td class='clmnav' onmouseover='chgClass(this)' onmouseout='retClass(this)'><div style='cursor:hand' onclick=window.location='/enterprise/lpadmin.asp'>企业管理</div></td><td class='clmnav' onmouseover='chgClass(this)' onmouseout='retClass(this)'><div style='cursor:hand' onclick=window.location='/enterprise/lpsearch.asp'>分类检索</div></td></tr></table>"
	}

var objTd = document.getElementsByTagName("td")
for(I=0;I<objTd.length;I++){
	if(objTd[I].innerText  == aryTitle[0]){
		objTd[I].className="clmnav_lt"
		}
	}
}

function chgClass(obj){
if(obj.className == "clmnav_lt"){
	ret = false
	}	
	else if(obj.className == "clmnav"){
		obj.className = 	"clmnav_lt"
		ret = true
		}
}

function retClass(obj){
if (ret == true){
	obj.className = 	"clmnav"
	}
}