// for video download and buy choose
function choosen(_this){
	document.getElementById("links").href=_this.value;
	for(i=1;i<=3;i++) document.getElementById("c"+i).className="";
	document.getElementById("c"+_this.id).className="on";
}

function tab_effect(tab,content,x){
	for(i=1;i<=x;i++){
		document.getElementById("tab"+i).className="";
		document.getElementById("content"+i).style.display="none";
	}
	document.getElementById(tab).className="tab_on";
	document.getElementById(content).style.display="";
}