fixed it with some php
<?
if ($PHP_SELF != '/rkhconsultants.co.uk/index.php')
{ $page1 = ''; } else { $page1 = 'selected'; }
if ($PHP_SELF != '/rkhconsultants.co.uk/how-it-works.php')
{ $page2 = ''; } else { $page2 = 'selected'; }
if ($PHP_SELF != '/rkhconsultants.co.uk/gas.php')
{ $page3 = ''; } else { $page3 = 'selected'; }
if ($PHP_SELF != '/rkhconsultants.co.uk/electric.php')
{ $page4 = ''; } else { $page4 = 'selected'; }
if ($PHP_SELF != '/rkhconsultants.co.uk/telecoms.php')
{ $page5 = ''; } else { $page5 = 'selected'; }
if ($PHP_SELF != '/rkhconsultants.co.uk/services.php')
{ $page6 = ''; } else { $page6 = 'selected'; }
if ($PHP_SELF != '/rkhconsultants.co.uk/contact.php')
{ $page7 = ''; } else { $page7 = 'selected'; }
?>
<form name="form" class="mob-nav">
<select name="jumpMenu" id="jumpMenu" onchange="MM_jumpMenu('parent',this,0)">
<option <?echo $page1;?> value="index.php">Home</option>
<option <?echo $page2;?> value="how-it-works.php">How it works</option>
<option <?echo $page3;?> value="gas.php">Gas</option>
<option <?echo $page4;?> value="electric.php">Electric</option>
<option <?echo $page5;?> value="telecoms.php">Telecoms</option>
<option <?echo $page6;?> value="services.php">Services</option>
<option <?echo $page7;?> value="contact.php">Contact</option>
</select>
</form>