onload = function runScript() {
    if (document.getElementById) {
        hideClass();
    } else {
        return true;
    }
}

function hideClass() {
	var e, i = 0;
	while (e = document.getElementsByTagName ('*')[i++]) {

		if (/\bhide\b/.test (e.className)) {
	        e.style.display = "none";
		}
	}
}

//hide everything except the specified element
function showIt(id) {
    var object = document.getElementById(id).style;
    if(document.getElementById("preamble")){
        document.getElementById("preamble").style.display = "none";
    }
    hideClass();
    object.display = "block";
}

//hide everything except the specified element, then fade it in.
function fadeIt (millisec, id) {
	showIt(id);
    changeOpac(0, id);
	opacity(id, 0, 99, 1000);
}

//if an element is hidden, show it, else make it hidden
function showToggle(id) {
    var object = document.getElementById(id).style;
    if (object.display == "none") {
      object.display = "block";
      } else {
      object.display = "none";
    }
}

//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 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 shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it invisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 99, millisec);
	} else {
		opacity(id, 99, 0, millisec);
         }
}

function blendImage(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
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 99; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	} 
}

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 picInfo(whichpic, divid, imageid, imagefile, millisec) {
    if (document.getElementById) {
        blendImage(divid, imageid, imagefile, millisec);
  
        if (whichpic.title) {
            document.getElementById('desc').childNodes[0].nodeValue = whichpic.title;
            } else {
                document.getElementById('desc').childNodes[0].nodeValue = whichpic.childNodes[0].nodeValue;
            } 
        return false;

    } else {
        return true;
    }
}