function checkAndDoSiteSearch(element){

	if(document.getElementById('gNaviRadioSite').checked){

		var input = document.createElement('input');

		input.id = "site_hidden_field";

		input.type = "hidden";

		input.name = "text";

		input.value = "site:" + getDomain();

		element.appendChild(input);

	} else {

		var childElement = document.getElementById('site_hidden_field');

		if(childElement){

			element.removeChild(childElement);

		}

	}

}



function getDomain(){

	var url = location.href;

	url.search(/(http:\/\/[^\/]+\/)/);

	return RegExp.$1;

}



function getSubDomain(){

	var url = location.href;

	url.search(/http:\/\/([^\.]+)\./);

	return RegExp.$1;

}