for   (   var   i   =   0;   i   <   arr.length;   i++   )     
          {   
                  if   (arr[i]   ==   p)     
                          SELECTED   =   "selected";   
                  else   
                          SELECTED   =   "";   
                  document.write("<option   value=\"",arr[i],"\"   ",SELECTED,">",arr[i]);   
          }   
一般option标签为 </option value="#">#<option>
那么想应的js中应为
document.write("</option value=\"#\">#<option>")而那句中</option>这个结束标签都没了还有几个逗号
蛮烦高手详解