function validateform() {

	var theform;

		if (window.navigator.appName.toLowerCase().indexOf("microsoft") > -1) {
			theform = document.qsform;
		}
		else {
			theform = document.forms["qsform"];
		}

		if (theform.loc.value=='place or postcode') {
			alert('Please enter a placename or postcode');
			theform.loc.focus();
			return false;
		}

		if (theform.loc.value.length==0) {
			alert('Please enter a placename or postcode');
			theform.loc.focus();
			return false;
		}

		return true;
}