need help to prepend() to text box

need help to prepend() to text box

hi to all 
i am having two text boxces if i enterthe values in one text box that is shown in starting of the text box in reverce order


<input type="text"  id="tbox1">
<input type="text"  id="tbox2">



$("#tbox1").keyup(function()
{$("#tbox2").val($("#tbox1").val());
}); 


 i want to show my text in first