// slideshow
function showimage(num) {
	var imagename = "./Images/gallery/" + photo[num];
	document.getElementById('slideshow').src = imagename;
	document.getElementById('caption').innerHTML= caption[num];
	var i;
	for(i=1; i <= imgs; i++){
		if(i == num){
			document.getElementById('gpic'+i).style.filter = 'alpha(opacity=100)';
			document.getElementById('gpic'+i).style.opacity = '1.0';
		}
		else{
			document.getElementById('gpic'+i).style.filter = 'alpha(opacity=50)';
			document.getElementById('gpic'+i).style.opacity = '0.5';
		}
	}
}
var imgcount=1;
function slideimage() {
	if( imgcount > imgs ) {
		imgcount = 1;
	}
	showimage( imgcount );
	if(divN[imgcount] > divCount){
		chgThumb('forward');
	}
	else if(divN[imgcount] < divCount){
		chgThumb('back');
	}
	imgcount++;
}
var slideid;
function startshow() {
	stopshow();
	slideid = setInterval("slideimage()",inttime);
	document.getElementById('btnslideshow').innerHTML= '<a href="javascript:void(0)" onclick="stopshow()"><img src="Images/bt_pause.gif" alt="Slide Show" /></a>';
}
function stopshow() {
	clearInterval(slideid);
	document.getElementById('btnslideshow').innerHTML= '<a href="javascript:void(0)" onclick="startshow()"><img src="Images/bt_slideshow.gif" alt="Slide Show" /></a>';
}

var divCount = 0;
function chgThumb(cmd){
	if (cmd == 'back'){
		divCount--;
	}
	else if (cmd == 'forward'){
		divCount++;
	}
	var i;
	for(i=0; i<divNum;i++){
		if(i == divCount){
			document.getElementById('thumb'+i).style.display = 'block';
		}
		else{
			document.getElementById('thumb'+i).style.display = 'none';
		}
	}
	if(divCount == 0){
		document.getElementById('gback').style.visibility = 'hidden';
	}
	else{
		document.getElementById('gback').style.visibility = 'visible';
	}
	if(divCount+1 == divNum){
		document.getElementById('gnext').style.visibility = 'hidden';
	}
	else{
		document.getElementById('gnext').style.visibility = 'visible';
	}
}