function gearbox()
	{	
		var form = document.forms[0];
		var chosen;
		chosen = 'index.php?gid=' + form.fm_gearbox.value + '#subindex';
		self.location=chosen;
	} 
	
function motor()
	{	
		var form = document.forms[0];
		var chosen;
		chosen = 'index.php?mid=' + form.fm_motor.value + '#subindex';
		self.location=chosen;
	}