下拉框和输入框的综合

<div   style="position:relative;">  
  <span   style="margin-left:100px;width:18px;overflow:hidden;">  
  <select   style="width:118px;margin-left:-100px"   >  
  <option   value="aaaa">   aaaa   </option>  
  <option   value="bbbb">   bbbb   </option>  
  <option   value="cccc">   ccccc   </option>  
  </select></span><input     style="width:100px;;left:0px;">  
  </div>