function matchCity() {
	pu = document.carform.pucity[document.carform.pucity.selectedIndex].value //city to match
	for (i=0; i < document.carform.docity.options.length; i++) {
		if (document.carform.docity[i].value == pu)	{
			document.carform.docity.selectedIndex = i;
			break;
			}
		}
	}