jQuery > Change getElementbyId.selectedIndex with option text value - php

Question

I've tried various thing to get to what I want but i'm in the woods completely.
Let me explain what is required.
I have a php variable containing a string equal to an option's value and I need to get the option corresponding to the string to be selected.
This is the select tag.
<select name="pos" id="pos">
<option value="">POS</option>
<option value="C">C</option>
<option value="LW">LW</option>
<option value="RW">RW</option>
<option value="LD">LD</option>
<option value="RD">RD</option>
<option value="G">G</option>
</select>
Example :
$string = "G";
Resulting select tag :
<select name="pos" id="pos">
<option value="">POS</option>
<option value="C">C</option>
<option value="LW">LW</option>
<option value="RW">RW</option>
<option value="LD">LD</option>
<option value="RD">RD</option>
<option value="G" selected>G</option>
</select>
Thanks a lot guys. I've been working on this forever and got no where.

Answer 1

Using jQuery:
// find required element
var el = jQuery('select#pos option[value="G"]')
// or
var el = jQuery('select#pos option').filter(function(){return jQuery(this).text()=="G"})
// set 'selected' attribute
el.attr("selected", "selected");
// find selected option
var el = jQuery('select#pos option:selected');
// get value
el.text()