Need To Upload files with PHP and Ajax

[itpvision]

Hello,

I have a registration page, it is processed to a php script through ajax and javascript,

The script worked until a input type file is involved

 

  var params = "username=" + encodeURI(document.getElementById("usernamee").value)+

"&password=" + encodeURI(document.getElementById("passwordd").value)+

"&name=" + encodeURI(document.getElementById("name").value)+

"&pic=" + pik +

;

 

As you may see,the  value retrived from the input type file with id and name as pic, this will send a usual $_POST['pic'] , while I need to Process _$FILE['pic'];

How can I send the value of a file

[kenrbnsn]

Please dont' double post. Locked.