btnClick=0;
/*if(window.attachEvent){	   
        document.getElementById('btn_next').attachEvent("onclick",btnNext_onClick,false);
	document.getElementById('btn_back').attachEvent("onclick",btnBack_onClick,false);			 
}else{
	document.getElementById('btn_next').addEventListener("click",btnNext_onClick,false);
	document.getElementById('btn_back').addEventListener("click",btnBack_onClick,false);		
}*/
function getImageNumber(active_image){
    //alert(active_image);
    if(!isNaN(active_image)){
       // btnClick = active_image % 15;
        //alert(btnClick);
        //callXMLService(btnClick);
    }
}
function callXMLService(n){
    if(isNaN(n)){
        n=btnClick;
    }
    xmlObjNext = new XmlConnector(window.location.protocol + "//" + window.location.hostname +"/photo_service.php?num=" + n );
    xmlObjNext.XMLReq.onreadystatechange = xmlObjNext_onDataLoad;
    document.getElementById('photo_table').innerHTML='<div style="width:100%;text-align:center"><img src="/images/loading.gif" /><span style="padding-top:-4px;font-weight:bold">Please wait while loading photos...</span></div>';
}
function btnNext_onClick(){
    btnClick = btnClick +1;
    //alert(btnClick);
    callXMLService(btnClick);
    
}
function btnBack_onClick(){
    if(btnClick!=0){
        btnClick = btnClick - 1;
    }
    callXMLService(btnClick);
}
function xmlObjNext_onDataLoad(){		
  if (xmlObjNext.XMLReq.readyState == 4) {	
      
    if (xmlObjNext.XMLReq.status  == 200) {				
	var rsPhotos = xmlObjNext.XMLReq.responseXML.getElementsByTagName("photo");
        document.getElementById('photo_table').innerHTML = rsPhotos[0].childNodes[0].data ;    
    }
    
  }
  rsPhotos=null;
}