upload file in jquery and php

upload file in jquery and php


Hi
I hava one dialog box with input file in it .
  1. if(act=='exchangePic')
  2. {
  3. $("#dialog").attr('title','Change picture ').dialog({buttons:{'ok':{class:'btn',text:'Ok',click:function(){
  4. $('#imgHolder_'+picture_id).css({'background-color':''});
  5. $(this).dialog('close');
  7. }}}, show:'fade',hide:'explode',width:'380px',modal:true,closeText:' X  '}).html("<form><input type='file' id='newUpload' name='newUpload' class='upfile'/></form>");
  9. }//end of act=='exchangePic'

I want when click Ok button in dialog box selected file uploaded

How can I do this with jquery & php? Thanks