var photoGalleryPics;
var curPic = 0;
var nextPic;

photoGalleryPics = new Array (  
					"images/location1photogallery/1.gif", 
					"images/location1photogallery/2.gif", 
					"images/location1photogallery/3.gif", 
					"images/location1photogallery/4.gif"
		)

function loadSpecificPic(picNum){
	document.getElementById('location1photo').src = photoGalleryPics[picNum];	
	changeOpac(100, 'location1photo');
	changeOpac(0, 'location1photoHolder');
}

function prevPhoto(){
		nextPic=(curPic==0)? photoGalleryPics.length-1 : curPic-1;
		document.getElementById('location1photoHolder').src = photoGalleryPics[nextPic];
		
		shiftOpacity('location1photo', 500);
		shiftOpacity('location1photoHolder', 500);
		
		curPic = nextPic;
		setTimeout("resetImages()", 500);
}

function nextPhoto(){
		nextPic=(curPic<photoGalleryPics.length-1)? curPic+1 : 0;
		document.getElementById('location1photoHolder').src = photoGalleryPics[nextPic];
		
		shiftOpacity('location1photo', 500);
		shiftOpacity('location1photoHolder', 500);
		
		curPic = nextPic;
		setTimeout("resetImages()", 500);	
}

function resetImages(){
	
		document.getElementById('location1photo').src = photoGalleryPics[curPic];
		
		changeOpac(100, 'location1photo');
		changeOpac(0, 'location1photoHolder');
}

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 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)
} 

//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 + ")"; 
}
	// JavaScript Document
	
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);
    }
}