function validate() {

	var submit = false;

	if (document.forms['main'].street.value != ''){
		submit = true;
	} else if (document.forms['main'].location.value != ''){
		submit = true;
	} else if (document.forms['main'].county.value != ''){
		submit = true;
	} else if (document.forms['main'].postcode.value != ''){
		submit = true;
	}
	
	if (submit){
		document.forms['main'].submit();
	} else{
		alert("You must enter a value for either street, location, county or postcode");
	}
}

function resetForm(){
	document.forms['main'].street.value='';
	document.forms['main'].location.value='';
	document.forms['main'].county.value='';
	document.forms['main'].postcode.value='';
}