function update_frame(myoptions) 
{
        destination = myoptions[myoptions.selectedIndex].value;
        if (destination == "null")
        {
                return true;
        }
        window.open(destination, '_top');
        myoptions.selectedIndex = 0;

        return true;
}
//ÀÔ·Â Æû Á¦¾î ½ºÅ©¸³Æ®---------------------------------------------------------
function field_check(field_name, field_size, message) {
	if(field_name.value.length < field_size) {
		alert(message + "¶õÀÌ ÀԷµÇÁö ¾Ê¾Ò°Å³ª À߸ø ÀԷµǾú½À´Ï´Ù.")
		field_name.focus()
		return(true)
	} else return(false)
}

function number_check(field_name, message) {
	for(i=0; i < field_name.value.length; i++){
		if(field_name.value.charCodeAt(i) < 48 || field_name.value.charCodeAt(i) > 57) {
			alert(message + "¶õÀº ¼ýÀÚ¸¸ ÀÔ·Â °¡´ÉÇÕ´Ï´Ù.")
			field_name.focus()
			return(true)
		} else return(false)
	}
}

function email_check(field_name, message) {
	if(field_name.value.indexOf("@") < 1 || field_name.value.indexOf(".") < 3) {
		alert(message + "¶õÀÇ À̸ÞÀÏÁÖ¼Ò°¡ ¿Ã¹Ù¸£Áö ¾Ê½À´Ï´Ù.");
		filed_name.focus()
		return(true)
	} else return(false)
}
function errMsg(thisfield, msg) {
	alert (msg)
	thisfield.focus()
}

// --------------------------- Á¡ÇÁ ¸Þ´º ½ÃÀÛ ------------------------------------------------

function link_site_goto(sel, targetstr){
  var index = sel.selectedIndex;

  if (sel.options[index].value != '') {
     if (targetstr == 'blank') {
       window.open(sel.options[index].value, 'win1');
     } else {
       self.location = sel.options[index].value;
     }
  }
}
//------------------------------ Á¡ÇÁ ¸Þ´º ³¡ ---------------------------------------------------