var items = myfn("selectSub").getElementsByTagName("input");
        function myfn(o)
            { //获取对象
	            if(typeof(o) == "string")
	              {
	                 return document.getElementById(o);
	              }
	             return o;
            }
       function addPreItem()
           {	
	            myfn("previewPost").innerHTML = "";
	            var cl="#a2caed";
	            var c2="white";
	            var p1="pointer";
	            var p2="auto";
	            var len　= 0 ;
	            for(var i = 0 ; i < items.length ; i++)
	            { 
		            if(items[i].checked == true)
		                 {
			                len++;
			                 if(len > 3)
			                        {
				                         alert("不能超过3个选项！");
				                         return false;
			                         }
			                var mes = "<input type='checkbox' name='ckpost' checked='true' title='"+items[i].title+"' value='"+ items[i].value +"' onclick='copyItemPost(\"previewPost\",\"previewPost\");same(this);'>" + items[i].value;
			                myfn("previewPost").innerHTML += mes;
			                myfn("previewPost").innerHTML +="&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"
		                 }
	             }
	            
           }

        function makeSure()
          {
                var len;
                var items5 = myfn("previewPost").getElementsByTagName("input");
                for(var i = 0 ; i < items5.length ; i++)
	                  {
		                if(items5[i].checked == true)
		                    {
		                        len ="|"+items5[i].title;
                                window.dialogArguments.post(items5[i].value);
                                window.dialogArguments.posttitle(len);
                                window.close();
                             }
                      }

           }
        function copyItemPost(id1,id2)
        {
	            var mes = "";
	            var mes1 = "";
	            var items2 = myfn(id1).getElementsByTagName("input");
	            for(var i = 0 ; i < items2.length ; i++)
	                {
		                if(items2[i].checked == true)
		                        {
			                        mes += "<input type='checkbox' checked='true' title='"+items[i].title+"' value='"+ items2[i].value +"' onclick='copyItemPost(\"" + id2+ "\",\""+ id1 +"\");same(this);'>" + items2[i].value;		
		                        }
	                }
	            myfn(id2).innerHTML = "";
	            myfn(id2).innerHTML += mes;
        }
        function same(ck)
        {
            	for(var i = 0 ; i < items.length ; i++)
	                {
		                if(ck.value == items[i].value)
		                        {
			                        items[i].checked = ck.checked;
		                        }
	                }
        }	
        function showdiv(id)
        {
            var divId=myfn("divId").value;
             var showDivId=id;
            if(divId!="")
            {
                if(divId!=showDivId)
                { 
                    myfn(divId).style.display="none";
                 }
            }
            myfn(id).style.display="block";
            myfn("divId").value=id; 
        }