anchor.diff:  		var itemId = "";
           var len02 = list.length;
   	    for (var i=0;i<len02;i++) {
  -           itemId = itemId+list.options[i].value+",";
  +			if(list.options[i].value.length > 0){
  +               itemId = itemId+list.options[i].value+",";
  +			}
   	    }
           //alert(itemId);
   	    document.getElementById("exportTables").value = itemId;
  
positive.code: 	function exportSysTables(){
          var dbType = jQuery('#dbType').val();
  		if(confirm("确定导出'"+dbType+"'数据库的初始化脚本吗？")){
  		  document.iForm.action="<%=request.getContextPath()%>/mx/sys/table/exportSysTables?dbType="+dbType;
  		  document.iForm.submit();
  		}
  	}
  
  
negative.code: 		  <tr>
  			<td>
  			   <select id="selectedTables" name="selectedTables" style="width: 250px;" size="22">
  			      <%for(int i=0;i<500;i++){%>
  			       <option value=""></option>
  				  <%}%>
  			   </select>
  