function gallery(url){
	var parameter="toolbar=no,scrollbars=yes,status=no,resizable=yes,width=770,height=550";
	okno=window.open(url,"gallery",parameter);
}

var activeImg = 1;

function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 100, 0, millisec);
	}
}

function setImage(imageid,imagefile){
	document.getElementById(imageid).src = imagefile;
}

function blendimage(id,divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
	
	//make image transparent
	changeOpac(0, imageid);
	
	//make new image
	setTimeout("setImage('" + imageid + "','" + imagefile + "')",speed);

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}

	changeOpac(50, 'img' + activeImg);
	changeOpac(100, 'img' + id);
	activeImg = id;

	//document.getElementById(divid).style.backgroundImage = "none";
	
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}

function galInit(){
	document.getElementById("ir1").style.display = "block";
}

function shrPrev(node){
	var speed = Math.round(400 / 100);
	var timer = 0;

	var rowId = parseInt(node.parentNode.id.replace(/[^0-9]/g, ''));
	var prevId = rowId - 1;

	var showNode = document.getElementById("ir" + prevId);
	if(showNode) {
		document.getElementById("ir" + rowId).style.display = "none";
		changeOpac(0, "ir" + prevId);
		document.getElementById("ir" + prevId).style.display = "block";
		for(i = 0; i <= 100; i++) {
			setTimeout("changeOpac(" + i + ",'ir" + prevId  + "')",(timer * speed));
			timer++;
		}
	}
}

function shrNext(node){
	var speed = Math.round(400 / 100);
	var timer = 0;

	var rowId = parseInt(node.parentNode.id.replace(/[^0-9]/g, ''));
	var nextId = rowId + 1;

	var showNode = document.getElementById("ir" + nextId);
	if(showNode) {
		document.getElementById("ir" + rowId).style.display = "none";
		changeOpac(0, "ir" + nextId);
		document.getElementById("ir" + nextId).style.display = "block";
		for(i = 0; i <= 100; i++) {
			setTimeout("changeOpac(" + i + ",'ir" + nextId  + "')",(timer * speed));
			timer++;
		}
	}
}