function setcheck(){
	  var selList = document.getElementsByName("goods");
	  var selectAll = document.getElementById("selectAll").value;	
	  if(selectAll=="全選"){
	     document.getElementById("selectAll").value="撤銷";
	     for(var i=0;i<selList.length;i++){
	  	     selList[i].checked=true;
	     } 
	 }else{
	       document.getElementById("selectAll").value="全選";
	     for(var i=0;i<selList.length;i++){
	  	     selList[i].checked=false;}
	   }
	}