bytesToSize=function(bytes){
var sizes=[];
if(typeof (window.wpfdHelper)!=='undefined'&&typeof (window.wpfdHelper.fileMeasure)!=='undefined'&&window.wpfdHelper.fileMeasure.length > 0){
sizes=window.wpfdHelper.fileMeasure;
}else{
sizes=['B', 'KB', 'MB', 'GB', 'TB', 'PB'];
}
if(bytes <=0) return 'N/A';
var i=parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
return (bytes / Math.pow(1024, i)).toFixed(2) + ' ' + sizes[i];
};