var tab_no = -1;

function tab(_i){
	if(tab_no == 0){
		$$('div#SearchTab1.SearchTab img#Tab1')[0].src = './img/buy/buy_type_new_hit.gif';
	}
	for(var i = 1; i <= 3; i++){
		if(i == _i)Element.show('SearchTab' + i);
		else Element.hide('SearchTab' + i);
	}
	if(_i <= 1){
		Element.show('SearchButton2');
		Element.hide('SearchButton3');
		$('Main').style.backgroundImage = "url(../img/buy/city/buy_newbase.jpg)";
	}
	else if(_i == 2){
		Element.hide('SearchButton2');
		Element.show('SearchButton3');
		$('Main').style.backgroundImage = "url(../img/buy/city/buy_apartbase.jpg)";
	}
	else if(_i == 3){
		Element.hide('SearchButton2');
		Element.show('SearchButton3');
		$('Main').style.backgroundImage = "url(../img/buy/city/buy_landbase.jpg)";
	}
	if(tab_no == -1){
		Element.show('SearchTab1');
		tab_no = 0;
	}
	else{
		tab_no = _i;
	}
}

function submit(_i){
	var err = '';
	if(tab_no == 0){
		err += 'ご希望の「物件タイプ」を選択して下さい。';
	}
	if(_i == 0){
		var count = 0;
		$A($$('div#Condition' + tab_no + '_1 input')).each(function(c){
			if(c.checked){
				count++;
			}
		});
		if(count == 0){
			if(err != ''){
				err += '\n';
			}
			err += '利用駅を１つ以上選択して下さい。';
		}
	}
	if(err != ''){
		alert(err);
		return;
	}

	if(_i == 0){
		$('SearchForm' + tab_no).action="http://c21.to/realestate/search.cgi";
	}
	else{
		$('SearchForm' + tab_no).action="http://c21.to/realestate/st.cgi";
	}
	$('SearchForm' + tab_no).kh.value = _i;
	$('SearchForm' + tab_no).submit();
}