/*
+--------------------------------------------------------------------------
| function toggleTextBoxVisibility()
+--------------------------------------------------------------------------
*/
function toggleTextBoxVisibility(){

	var objTextboxElement = document.getElementById("textbox");
	var objFactLinkElement = document.getElementById("factlink");

	//Show/hide textbox
	if(objTextboxElement.style.visibility == "visible"){
		objTextboxElement.style.visibility = "hidden";
	}else{
		objTextboxElement.style.visibility = "visible";
	}

	//Set factlink color
	if(objTextboxElement.style.visibility == "visible"){
		objFactLinkElement.className = "black";
	}else{
		objFactLinkElement.className = "grayToBlack";
	}
}

/*
+--------------------------------------------------------------------------
| function initMainIm()
+--------------------------------------------------------------------------
*/
function initMainIm(imurl, imlist){
	var elem = document.getElementById("mainimg");
	elem.style.backgroundImage = 'url('+imurl+')';
	imlist.cacheNextImg();
}


/*
+--------------------------------------------------------------
| function opacity()
+--------------------------------------------------------------
*/
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++;
		}
	}
}

/*
+--------------------------------------------------------------
| function changeOpac()
+--------------------------------------------------------------
*/
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 + ")";
}