function navBtnSetup(){
	var btn_home    = document.getElementById('top_btn_home');
	var btn_contest	= document.getElementById('top_btn_contest');
	var btn_event	= document.getElementById('top_btn_event');
	var btn_blog	= document.getElementById('top_btn_blog');
	var btn_qna		= document.getElementById('top_btn_qna');

	var arr = new Array(btn_home,btn_contest,btn_event,btn_blog,btn_qna);

	for(var i=0,max=arr.length; i<max; i++){
		var img = arr[i];

		if(img.addEventListener){
			img.addEventListener('mouseover',imageSwitching,false);
			img.addEventListener('mouseout',imageSwitching,false);
		}else{
			img.attachEvent('onmouseover',imageSwitching);
			img.attachEvent('onmouseout',imageSwitching);
		}
	}
}

function imageSwitching(e){
	var target = (window.event)?window.event.srcElement:e.target;
	var src = target.src;

	var filename = src.substring(0,src.lastIndexOf('.'));
	filename = filename.substring(filename.lastIndexOf('/') + 1);

	if(filename.search('_off') > -1){
		target.src = src.replace('_off','');
	}else{
		target.src = src.replace(filename,filename + '_off');
	}
}

function init(){
	daumFlash('/2008/main.swf',486,509,'flash_banner');
	navBtnSetup();
}

function addLoadEvent(func)
{    
    var oldonload = window.onload;
    if (typeof window.onload != 'function')
    {
        window.onload = func;
    } 
    else 
    {
        window.onload = function()
        {
            oldonload();
            func();
        }
    }
}

addLoadEvent(init);