//--返回id名的对象
function $id(id)
{
	return document.getElementById(id);
}
//--
//获取对象y坐标
function getY(e)
{
 var   obj   =   e; 
 var   getTop   =   obj.offsetTop;
 while(obj   =   obj.offsetParent) 
 {
    getTop   +=   obj.offsetTop;  
 }
 return getTop;
}
//获取对象x坐标
function getX(e)
{
 var   obj   =   e; 
 var   getLeft   =   obj.offsetLeft; 
 while(obj   =   obj.offsetParent) 
 {
    getLeft   +=   obj.offsetLeft; 
 }
 return getLeft;
}
//--导航
function whatis(obj,obj2){	
    $id(obj).style.left=getX(obj2)-10+"px";
	$id(obj).style.top=getY(obj2)-26+"px";
	$id(obj).style.display="block";
}
function unwhatis(obj){
	$id(obj).style.display="none";
}
//--// JavaScript Document

function trim(s)
{
  while (s.substring(0,1) == ' ') {
    s = s.substring(1,s.length);
  }
  while (s.substring(s.length-1,s.length) == ' ') {
    s = s.substring(0,s.length-1);
  }
  return s;
}

function isNotEmpty(e)
{
	str = trim(e.value);
	var reg = /./;
	if (str.match(reg))
	{
		return true;
	}
	else
	{
		e.focus(); 
		return false;
	}
}