var intro_opac=100;
var introRunning = 1, introFading = 0, introTimeout=20000;

function fadeInIntro() {
	if (intro_opac >= 100) return;
	var intro = document.getElementById("intro");
	intro_opac += 10;
	intro.style.filter = "alpha(opacity=" + intro_opac + ")";
	intro.style.opacity = intro_opac/100.0;
	setTimeout("fadeInIntro()", 100);
}

function fadeOutIntro() {
	if (introFading) {
		clearTimeout(introFading);
		introFading = 0;
	}
	var intro = document.getElementById("intro");
	if (intro_opac <= 0) {
		intro.style.display="none";
		introRunning=0;
		return;
	}
	intro_opac -= 10;
	intro.style.filter = "alpha(opacity=" + intro_opac + ")";
	intro.style.opacity = intro_opac/100.0;
	setTimeout("fadeOutIntro()", 50);
}

function showIntro() {
	if (introRunning) return;
	var intro = document.getElementById("intro");
	intro.src = "media/images/intro_1301.gif";
	intro.style.display="block";
	introFading = setTimeout("fadeOutIntro()", introTimeout);
	introRunning=1;
	fadeInIntro();
}