/*
obj:文件选择框指针
descObjID:文件名ID
调用:<Input type="file" id="fMb" class="TextBox" onchange="SetDocName(this,'tb_DescObj')" runat="server" name="fMb"/>
*/
function SetDocName(obj,descObjID)
{
	var descObj = eval(descObjID);
	var value = obj.value;
	var lpos = value.lastIndexOf("\\");
	var dpos = value.lastIndexOf(".");
	value = value.substring(lpos+1,dpos);
	descObj.value = value;
}