function setHead(ChannelId){
	//alert(ChannelId);
	var navtitle;
	switch(ChannelId)
	{
	 case 1:
	   navtitle=document.getElementById("nav_title1");
	   navtitle.className ="mall"
     break
	 case 2:
	   navtitle=document.getElementById("nav_title2");
	   navtitle.className ="mall"
     break
	 case 3:
	   navtitle=document.getElementById("nav_title3");
	   navtitle.className ="mall"
     break
	 case 4:
	   navtitle=document.getElementById("nav_title4");
	   navtitle.className ="mall"
     break
	 case 5:
	   navtitle=document.getElementById("nav_title5");
	   navtitle.className ="mall"
     break
	 case 6:
	   navtitle=document.getElementById("nav_title6");
	   navtitle.className ="mall"
     break
	}
}