function bannerBlock(){
	var div_obj = document.getElementsByTagName("div");
	var last_num = div_obj.length - 1;
	div_obj[last_num].style.display = "none";
	var table_obj = document.getElementsByTagName("table");
	if(div_obj[0].id != ""){
		table_obj[0].style.display = "none";
	}else{
		div_obj[0].style.display = "none";
	}
	//alert(div_obj[0].id);
}
function openWindow(subURL,subWidth,subHeight){
	var subWidth_num = subWidth+50;
	var subHeight_num = subHeight+80;
	var option_str = "width="+subWidth_num+",height="+subHeight_num+",left=0,top=0,scrollbars=yes,locationbar=no,manubar=no,resizable=no,status=no,toolbar=no";
	subWin = window.open(subURL,"sub",option_str);
	subWin.resizeTo(subWidth_num,subHeight_num);
	subWin.focus();
}
function changePtn(){
	var rand_num = Math.floor(Math.random()*8+1);
	if(rand_num < 10){
		document.body.style.backgroundImage = "url(images/ptn_0"+rand_num+".gif)";
	}else{
		document.body.style.backgroundImage = "url(images/ptn_"+rand_num+".gif)";
	}
}
function changeClap(arg){
	if(arg == true){
		document.webclap.src = "images/btn_clap_over.gif";
	}else{
		document.webclap.src = "images/btn_clap_out.gif";
	}
}