function addLoadEvent(func) {
	var oldonload = window.onload;
	  if (typeof window.onload != 'function') {
		window.onload = func;
	  } else
	    {
		window.onload = function() {
		  oldonload();
		  func();
		}
	  }
	}
	// imgover
	function imgOver() {
	  var aImages = document.getElementsByTagName('img');
	  for(var i=0; i<aImages.length; i++) {
		if (aImages[i].className == 'imgover') {
		  aImages[i].onmouseover = function() {
			var img_src =  this.getAttribute('src');
			img_src = img_src.replace("_off", "_on");
			this.setAttribute('src', img_src);
			}
		   aImages[i].onmouseout = function() {
			  var img_src =  this.getAttribute('src');
			  img_src = img_src.replace("_on", "_off");
			  this.setAttribute('src', img_src);
		   }
		}
	  }
	  return false;
	}
	addLoadEvent(imgOver);

	function gId(id){
		return document.getElementById(id);
	}
	function gNa(obj,na){
		return obj.getElementsByTagName(na);
	}

function tab_event(id,eleName){
	if (!gId(id)){return false;}
	eleType = gNa(gId(id),eleName);
	divs = document.getElementById(id).getElementsByTagName('div');
	ps = document.getElementById(id).getElementsByTagName('p');
	//alert(divs.length);
	//alert(eleType.length);
	var n= 0;
	for (var i=0; i<eleType.length; i++)
	{
		eleType[i].n = i;
		eleType[i].onclick = actEvent;
		eleType[i].dblclick = actEvent;

	}
	function actEvent(){
		for (var j=0; j<eleType.length; j++)
		{
			if (this == eleType[j]){
				//alert(this.valueOf());
				this.className = "on";
				divs[j].className = 'on';
				ps[j].className = 'on';
			} else {
				eleType[j].className = eleType[j].className.replace('on', '');
				divs[j].className = divs[j].className.replace('on', '');
				ps[j].className = ps[j].className.replace('on', '');
			}
		}
	}
}

//페이지 로드 할때 부르는 함수 onload와 같음
addLoadEvent(function(){
	//이벤트 붙치고 
	tab_event("con3","h3");
	//alert(selectDiv);
	// 2011.03.17 허강과장요청
	var selectDiv = parseInt(Math.random()*10) % divs.length;
	//var selectDiv = 2;
	switch(selectDiv){
		case 0: 
			changeClass(selectDiv); break;
		case 1:
			changeClass(selectDiv); break;
		case 2:
			changeClass(selectDiv); break;
	}
	
})
//div 클래스 변경 메소드 
function changeClass(selectDiv)
{
		for (var j=0; j<eleType.length; j++)
		{
			if (j == selectDiv){
				eleType[j].className += " on";
				divs[j].className += ' on';
				ps[j].className += ' on';
			} else {
				eleType[j].className = eleType[j].className.replace('on', '');
				divs[j].className = divs[j].className.replace('on', '');
				ps[j].className = ps[j].className.replace('on', '');
			}
		}		
}