function checkform() {
	var kw = document.getElementById('keyword1').value;	
	var cate = document.getElementById('category1').value;	
	var area = document.getElementById('area1').value;
	
	if(kw == "" && cate== "" && area=="") {		
		alert("ÇëÑ¡Ôñ²éѯÌõ¼þ!");
		return false;
	}
	else {
		document.getElementById('searchform').submit;
	}
 }

function tab(id1, id2) {
	
	var cont1 = document.getElementById("mod_cont"+id1)
	var cont2 = document.getElementById("mod_cont"+id2)

	if(cont1.style.display == "none") {
		cont1.style.display ="block";
		cont2.style.display ="none";
	}
	else {
		cont1.style.display ="none";
		cont2.style.display ="block";
	}	
}