/* Preload ----------------------------------------------------
--------------------------------------------------------------*/

function f_loadPass(imgPass){
	if(document.images){
		
		//-- Global Navi -------
		home_off = new Image(); home_off.src = imgPass + "images/common/home.gif";
		home_ov = new Image(); home_ov.src = imgPass + "images/common/home_ov.gif";
		
		graduate_off = new Image(); graduate_off.src = imgPass + "images/common/graduate.gif";
		graduate_ov = new Image(); graduate_ov.src = imgPass + "images/common/graduate_ov.gif";
		
		contact_off = new Image(); contact_off.src = imgPass + "images/common/contact.gif";
		contact_ov = new Image(); contact_ov.src = imgPass + "images/common/contact_ov.gif";
		
		sitemap_off = new Image(); sitemap_off.src = imgPass + "images/common/sitemap.gif";
		sitemap_ov = new Image(); sitemap_ov.src = imgPass + "images/common/sitemap_ov.gif";
		
		company_off = new Image(); company_off.src = imgPass + "images/common/company.gif";
		company_ov = new Image(); company_ov.src = imgPass + "images/common/company_ov.gif";
		
		recruit_off = new Image(); recruit_off.src = imgPass + "images/common/recruit.gif";
		recruit_ov = new Image(); recruit_ov.src = imgPass + "images/common/recruit_ov.gif";
		
		eco_off = new Image(); eco_off.src = imgPass + "images/common/eco.gif";
		eco_ov = new Image(); eco_ov.src = imgPass + "images/common/eco_ov.gif";
		
		news_off = new Image(); news_off.src = imgPass + "images/common/news.gif";
		news_ov = new Image(); news_ov.src = imgPass + "images/common/news_ov.gif";
		
		
		//-- Footer Navi -------
		privacy_off = new Image(); privacy_off.src = imgPass + "images/common/privacy.gif";
		privacy_ov = new Image(); privacy_ov.src = imgPass + "images/common/privacy_ov.gif";
		
		use_off = new Image(); use_off.src = imgPass + "images/common/use.gif";
		use_ov = new Image(); use_ov.src = imgPass + "images/common/use_ov.gif";
		
		link_off = new Image(); link_off.src = imgPass + "images/common/link.gif";
		link_ov = new Image(); link_ov.src = imgPass + "images/common/link_ov.gif";
		
		
		//-- Side Navi -------
		
		return_off = new Image(); return_off.src = imgPass + "images/common/return_top.gif";
		return_ov = new Image(); return_ov.src = imgPass + "images/common/return_top_ov.gif";
		
		return_service_off = new Image(); return_service_off.src = imgPass + "images/common/return_service.gif";
		return_service_ov = new Image(); return_service_ov.src = imgPass + "images/common/return_service_ov.gif";
		
		
		//-- Index Navi -------
		
		
		btn_others_off = new Image(); btn_others_off.src = imgPass + "images/btn_others.gif";
		btn_others_ov = new Image(); btn_others_ov.src = imgPass + "images/btn_others_ov.gif";
		
		btn_past_off = new Image(); btn_past_off.src = imgPass + "images/btn_past.gif";
		btn_past_ov = new Image(); btn_past_ov.src = imgPass + "images/btn_past_ov.gif";
	}
}



/* RollOver ---------------------------------------------------
--------------------------------------------------------------*/
function f_imgOver(imgName){
	
	if(this[imgName+"_ov"])
		document[imgName].src = eval(imgName + "_ov.src");
}

function f_imgOut(imgName){
	
	if(this[imgName+"_off"])
		document[imgName].src = eval(imgName + "_off.src");
}




var DDSPEED = 10;
var DDTIMER = 15;

// main function to handle the mouse events //
function ddMenu(id,d){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearInterval(c.timer);
  if(d == 1){
    clearTimeout(h.timer);
    if(c.maxh && c.maxh <= c.offsetHeight){return}
    else if(!c.maxh){
      c.style.display = 'block';
      c.style.height = 'auto';
      c.maxh = c.offsetHeight;
      c.style.height = '0px';
    }
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }
}

// collapse the menu //
function ddCollapse(c){
  c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}

// cancel the collapse if a user rolls over the dropdown //
function cancelHide(id){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
}

// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = (Math.round((c.maxh - currh) / DDSPEED));
  }else{
    dist = (Math.round(currh / DDSPEED));
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  c.style.height = currh + (dist * d) + 'px';
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}