var iCheck = 0 ;
function SelectAll(theForm)
{
	if (iCheck==0)
	{
		for (var i=0;i<theForm.elements.length;i++)
		{
			theForm.elements[i].checked = true ;
			iCheck = 1 ;
			var the_obj = event.srcElement ;
			the_obj.alt = "全部取消" ;
			the_obj.src="Images/icon_selectall.gif" ;

		}
	}
	else
	{
		for (var i=0;i<theForm.elements.length;i++)
		{
			theForm.elements[i].checked = false ;
			iCheck = 0 ;
			var the_obj = event.srcElement ;
			the_obj.alt = "全部选定" ;
			the_obj.src="Images/icon_select.gif" ;
		}
	}
}