// JavaScript Document

//Declieration for Image path
var imgPic = new Array();
	imgPic[0] = "images/worldglobes/pic01.jpg";
	imgPic[1] = "images/worldglobes/pic02.jpg";
	imgPic[2] = "images/worldglobes/pic03.jpg";
	imgPic[3] = "images/worldglobes/pic04.jpg";
	imgPic[4] = "images/worldglobes/pic05.jpg";
	imgPic[5] = "images/worldglobes/pic06.jpg";
	imgPic[6] = "images/worldglobes/pic07.jpg";
	imgPic[7] = "images/worldglobes/pic08.jpg";
	imgPic[8] = "images/worldglobes/pic09.jpg";
	imgPic[9] = "images/worldglobes/pic10.jpg";
	imgPic[10] = "images/worldglobes/pic11.jpg";
	imgPic[11] = "images/worldglobes/pic12.jpg";
	

//do not customize the following values
var millisec = 500;
var contrl = 0;
var imgCount = 0;


//section for next/previous function
function slideImg(contrlval, opacStart, opacEnd) { 
    //speed for each frame 
    var speed = Math.round(millisec / 100); 
    var timer = 0; 
	var obj = document.getElementById('previewImg');
	
	obj.style.opacity = 0;
	obj.style.MozOpacity = 0; 
	obj.style.KhtmlOpacity = 0; 
	obj.style.filter = "alpha(opacity= "+ 0 +")";
	
	if(contrl > contrlval){ //for PREVIOUS function
		if(imgCount == 0){
			imgCount = imgPic.length;
			obj.src = imgPic[imgCount-1];
			
			if(opacStart < opacEnd) { 
				for(i = opacStart; i <= opacEnd; i++) 
					{
					setTimeout("changeOpac(" + i + ", 'previewImg')",(timer * speed)); 
					timer++;  
				}
			}
		}
		else{
			obj.src = imgPic[imgCount-1];
			
			if(opacStart < opacEnd) { 
				for(i = opacStart; i <= opacEnd; i++) 
					{
					setTimeout("changeOpac(" + i + ", 'previewImg')",(timer * speed)); 
					timer++;  
				}
			}
		}
		
		imgCount--;
	}
	else if(contrl < contrlval){ //for NEXT function
		if(imgCount == (imgPic.length-1)){
			imgCount = -1;
			obj.src = imgPic[imgCount+1];
			
			if(opacStart < opacEnd) { 
				for(i = opacStart; i <= opacEnd; i++) 
					{
					setTimeout("changeOpac(" + i + ", 'previewImg')",(timer * speed)); 
					timer++;  
				}
			}
		}
		else{
			obj.src = imgPic[imgCount+1];
			
			if(opacStart < opacEnd) { 
				for(i = opacStart; i <= opacEnd; i++) 
					{
					setTimeout("changeOpac(" + i + ", 'previewImg')",(timer * speed)); 
					timer++;  
				}
			}
		}
		
		imgCount++;
	}
}


//change the opacity for different browsers 
function changeOpac(opacity, obj) {
	var object = document.getElementById(obj).style;
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
}