var vwidth = 73;
var vslides = 6;
function move_vslideshow(direction) {
	//first, find the current left position
	var left = document.getElementById('vslidezone').style.left;
	if (left == null || left == '') {
		left = 0;
	} else {
		left = left.replace(/px/, '');
		left = eval(left);
	}
	
	//then, look if we can move in the requested direction
	if ((left == 0) && (direction == 1)) {
		return false;
	}
	if ((left*-1 >= vwidth*(vslides-3)) && (direction == -1)) {
		return false;
	}
	left = left+vwidth*direction;
	
	//and enable/disable the links on the side if needed
	var tds = document.getElementById('multimedia_slide').getElementsByTagName('td');
	if (left <= -1*vwidth) {
		tds.item(0).getElementsByTagName('a').item(0).style.display = 'inline';
		tds.item(0).getElementsByTagName('span').item(0).style.display = 'none';
	} else {
		tds.item(0).getElementsByTagName('a').item(0).style.display = 'none';
		tds.item(0).getElementsByTagName('span').item(0).style.display = 'inline';
	}
	if (left*-1 >= vwidth*(vslides-3)) {
		tds.item(2).getElementsByTagName('a').item(0).style.display = 'none';
		tds.item(2).getElementsByTagName('span').item(0).style.display = 'inline';
	} else {
		tds.item(2).getElementsByTagName('a').item(0).style.display = 'inline';
		tds.item(2).getElementsByTagName('span').item(0).style.display = 'none';
	}
	
	document.getElementById('vslidezone').style.left = left+'px';
}

function switch_video(the_id){
	if(the_id != current_video){
		document.getElementById('current_player').innerHTML = videos[the_id];
		document.getElementById('videos_text').innerHTML = videos_text[the_id];
	}
}

var player = new Array('player_video', 'player_audio');
function show_tab(tabs, name) {
	for (var i=0; i<tabs.length; i++) {
		var panel = document.getElementById(tabs[i]+'_panel');
		
		if (name == tabs[i]) {
			panel.style.display = 'block';
		} else {
			panel.style.display = 'none';
		}
	}
}