function valPostcodeFrm(){
	showAlert('');
	if(document.landReg.searchKey.value==""){
		showAlert('Please enter a valid  street, town or postcode.');
		return false;
	}
}
function valMarketSummaryFrm(){
	showAlert('');
	if(document.marketSummary.postcode.value==""){
		showAlert('Please enter a valid postcode.');
		return false;
	}
}