function xGetElementById(e)
{
  if(typeof(e)!='string') return e;
  if(document.getElementById) e=document.getElementById(e);
  else if(document.all) e=document.all[e];
  else e=null;
  return e;
}

function showHideLayers(name,v) {
	var obj=xGetElementById(name);
	if (obj!=null) {
		if (obj.style) {
			obj=obj.style;
			v=(v=='show')?'visible':(v=='hide')?'hidden':v;
		}
		obj.visibility=v;
	}
}

    function selectbox_hidden(layer_id) 
    { 
        var ly = eval(layer_id); 

        // 레이어 좌표 
        var ly_left  = ly.offsetLeft; 
        var ly_top    = ly.offsetTop; 
        var ly_right  = ly.offsetLeft + ly.offsetWidth; 
        var ly_bottom = ly.offsetTop + ly.offsetHeight; 

        // 셀렉트박스의 좌표 
        var el; 

        for (i=0; i<document.forms.length; i++) { 
            for (k=0; k<document.forms[i].length; k++) { 
                el = document.forms[i].elements[k];    
                if (el.type == "select-one") { 
                    var el_left = el_top = 0; 
                    var obj = el; 
                    if (obj.offsetParent) { 
                        while (obj.offsetParent) { 
                            el_left += obj.offsetLeft; 
                            el_top  += obj.offsetTop; 
                            obj = obj.offsetParent; 
                        } 
                    } 
                    el_left  += el.clientLeft; 
                    el_top    += el.clientTop; 
                    el_right  = el_left + el.clientWidth; 
                    el_bottom = el_top + el.clientHeight; 

                    // 좌표를 따져 레이어가 셀렉트 박스를 침범했으면 셀렉트 박스를 hidden 시킴 
                    if ( (el_left >= ly_left && el_top >= ly_top && el_left <= ly_right && el_top <= ly_bottom) || 
                        (el_right >= ly_left && el_right <= ly_right && el_top >= ly_top && el_top <= ly_bottom) || 
                        (el_left >= ly_left && el_bottom >= ly_top && el_right <= ly_right && el_bottom <= ly_bottom) || 
                        (el_left >= ly_left && el_left <= ly_right && el_bottom >= ly_top && el_bottom <= ly_bottom) ) 
                        el.style.visibility = 'hidden'; 
                } 
            } 
        } 
    } 

    // 감추어진 셀렉트 박스를 모두 보이게 함 
    function selectbox_visible() 
    { 
        for (i=0; i<document.forms.length; i++) { 
            for (k=0; k<document.forms[i].length; k++) { 
                el = document.forms[i].elements[k];    
                if (el.type == "select-one" && el.style.visibility == 'hidden') 
                    el.style.visibility = 'visible'; 
            } 
        } 
    }