var gal=new Array();

//-----------------------------------------------------------------------------------------------------
function changeElementDisplay (elName, displayType) {
	document.getElementById(elName).style.display = displayType;
}
//-----------------------------------------------------------------------------------------------------
function hideElement (elName) {
	changeElementDisplay(elName, "none");
}
//-----------------------------------------------------------------------------------------------------
function showElement (elName) {
	changeElementDisplay(elName, "block");
}
//-----------------------------------------------------------------------------------------------------
function showGalleryIntro () {
	hideElement("gallery");
	showElement("intro");
}
//-----------------------------------------------------------------------------------------------------
function hideGalleryIntro () {
	hideElement("intro");
	showElement("gallery");
}
//-----------------------------------------------------------------------------------------------------
function setBigPic (picNr) {
	document["galpic"].src = gal["pic"][picNr];
	gal["cur"] = picNr;
	document.getElementById("galpicsubtitle").innerHTML = gal["subtitle"][picNr];
}
//-----------------------------------------------------------------------------------------------------
function nextBigPic () {
	if (gal["cur"] >= (gal["pic"].length -1)) { 
		gal["cur"] = (gal["pic"].length -1);
	}
	else { 
		gal["cur"]++;
	}
	setBigPic(gal["cur"]);
}
//-----------------------------------------------------------------------------------------------------
function prevBigPic (galNr) {
	if (gal["cur"] <= 0) {
		gal["cur"] = 0;
	}
	else {
		gal["cur"]--;
	}
	setBigPic(gal["cur"]);
}