// JavaScript Document
var oldImage;
var imageName;
function changeMainImage2(imageName) 	{
	
    document.getElementById("main_image").src = imageName;
	oldImage=imageName;
}

function changeMainImage(imageName,ptext)	{
	//opacity("main_image", 99, 0, 2000);
	opacity("main_image", 0, 100, 500);
    document.getElementById("main_image").src = imageName;
	//opacity("main_image", 0, 99, 2000);
	document.getElementById("text").innerHTML = ptext;
	//changeText(ptext);
}

function changeMainImageOnly(imageName)
	{
		//alert(imageName+"<--new      old-->"+oldImage);
		//alert(oldImage);
	//document.getElementById("main_image").src = oldImage;
	opacity("main_image", 99, 0, 2000);
	//document.getElementById("main_image").src = imageName;
	//opacity("main_image", 0, 100, 2000);
    document.getElementById("main_image").src = imageName;
	opacity("main_image", 0, 99, 2000);
	//opacity("main_image", 50, 100, 2000);
    //document.getElementById("main_image").src = imageName;
	oldImage=imageName;
	}
function changeText(ptext)
	{
	
    
	
	}

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 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 <= 100; 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)
}