function GetObj(objName)
{
    if(document.getElementById) 
     return eval('document.getElementById("'+objName+'")');
    else
    return eval('document.all.'+objName);
}
	
function ShowNav(num){ //导航条舌签功能
	for(var i = 1;i <= 10;i++){
		if(GetObj("N_Menu_" + i)){GetObj("N_Menu_" + i).className = '';}
		if(GetObj("N_Cont_" + i)){GetObj("N_Cont_" + i).style.display = 'none';}
	}
	if(GetObj("N_Menu_" + num)){GetObj("N_Menu_" + num).className = 'selected';}
	if(GetObj("N_Cont_" + num)){GetObj("N_Cont_" + num).style.display = 'block';}
	 
}