function set_compare_prop(check_id) {
	var chk = '0';
	if ( $(check_id).checked ) {
		chk = '1';
	}
	new Ajax.Request('http://www.seniorsbluebook.com/ajax/compare.php?id='+ $(check_id).value + '&on='+ chk, {
		method: 'post',
		parameters: { last_place: window.location },
		onSuccess: function(transport){
			var response = transport.responseText;
			if ( response != '' ) {
				alert( response );
				$(check_id).checked = false;
			}
		},
		onFailure: function(){
			alert('Something went wrong...');
		}
	});
}