/* ドロップダウン　メニュー　*/

var TimeOut         = 300;
var currentLayer    = null;
var currentitem     = null;
var currentLayerNum = 0;
var noClose         = 0;
var closeTimer      = null;

function mopen(n) {
  var l  = document.getElementById("menu" + n);
  var mm = document.getElementById("mmenu" + n);
	
  if(l) {
    mcancelclosetime();
    l.style.visibility='visible';
    if(currentLayer && (currentLayerNum != n))
      currentLayer.style.visibility='hidden';
    currentLayer = l;
    currentitem = mm;
    currentLayerNum = n;			
  } else if(currentLayer) {
    currentLayer.style.visibility='hidden';
    currentLayerNum = 0;
    currentitem = null;
    currentLayer = null;
 	}
}

function mclosetime() {
  closeTimer = window.setTimeout(mclose, TimeOut);
}

function mcancelclosetime() {
  if(closeTimer) {
    window.clearTimeout(closeTimer);
    closeTimer = null;
  }
}

function mclose() {
  if(currentLayer && noClose!=1)   {
    currentLayer.style.visibility='hidden';
    currentLayerNum = 0;
    currentLayer = null;
    currentitem = null;
  } else {
    noClose = 0;
  }
  currentLayer = null;
  currentitem = null;
}

document.onclick = mclose; 



function smartRollover() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");

		for(var i=0; i < images.length; i++) {
			if(images[i].getAttribute("src").match("_off."))
			{
				images[i].onmouseover = function() {
					this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));
				}
				images[i].onmouseout = function() {
					this.setAttribute("src", this.getAttribute("src").replace("_on.", "_off."));
				}
			}
		}
	}
}

if(window.addEventListener) {
	window.addEventListener("load", smartRollover, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", smartRollover);
}

MM_preloadImages(
'http://urethane-gum.com/images/common/navi_1_on.jpg',
'http://urethane-gum.com/images/common/navi_2_on.jpg',
'http://urethane-gum.com/images/common/navi_3_on.jpg',
'http://urethane-gum.com/images/common/navi_4_on.jpg',
'http://urethane-gum.com/images/common/navi_5_on.jpg',
'http://urethane-gum.com/images/common/navi_6_on.jpg',
'http://urethane-gum.com/images/btn_ichiran_on.gif',
'http://urethane-gum.com/images/btn_more_on.gif',
'http://urethane-gum.com/images/common/btn_form_on.gif',
'http://urethane-gum.com/images/common/bn_speed_on.jpg',
'http://urethane-gum.com/images/common/btn_back_top_on.jpg',
'http://urethane-gum.com/images/common/bn_3s_on.jpg',
'http://urethane-gum.com/images/common/bn_kodawari_on.jpg',
'http://urethane-gum.com/images/common/bn_voice_on.jpg',
'http://urethane-gum.com/images/common/bn_blog_on.jpg',
'http://urethane-gum.com/images/common/bn_faq_on.jpg',
'http://urethane-gum.com/images/common/bn_twitter_on.jpg',
'http://urethane-gum.com/images/common/btn_menu_back_on.jpg'
)

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}