How to pass a Jquery variable to php variables for the Select Query?

<script type='text/javascript'>

$(window).load(function(){
   $("body").click(function(){

        var s = window.getSelection();
        s.modify('extend','backward','word');
        var b = s.toString();

        s.modify('extend','forward','word');
        var a = s.toString();
        s.modify('move','forward','character');

        var variablej=b+a; //variablej is Jquery Variable

       //how to pass a Jquery variable to php variable
      <?php   $variablephp = "<script>document.write(variablej)</script>"   ?> //variablephp is php variable

<?php $result = mysql_query("SELECT * FROM translate where English='$variablephp'"); ?>

</script>