function changeImage(index){
		document.getElementById("MediaSet").style.backgroundImage = "url("+imageArray[index]+")";
		document.getElementById("mediaTitle").innerHTML = imageTitleArray[index];
		document.getElementById("mediaDesc").innerHTML = imageDescArray[index];
}		
	
	
	
	function changeImgModel(index){
		document.getElementById("imgMediaSet").src= imageArray[index];
	}	
	
	
function nextModel(){
		 if (index == imageSize-1){ 
			index = 0;
		}else{
			index++;
		}
	  changeImgModel(index);
}
	
function prevModel(){
		if (index == 0){
			index = imageSize-1;
		}else{ 
			index--;
			}
   	  changeImgModel(index);
}
	
function next(){
		 if (index == imageSize-1){ 
			index = 0;
		}else{
			index++;
		}
	  changeImage(index);
}
	
function prev(){
		if (index == 0){
			index = imageSize-1;
		}else{ 
			index--;
			}
   	  changeImage(index);
}
		
function downloadHandler(selectObject) {
	 var selObj=selectObject;
	 var selIndex = selObj.selectedIndex;
	 var url = selObj.options[selIndex].value;
		 window.open(url, '_blank');
		 selObj.selectedIndex=0;	 
}