function previewImage(fileInfo) { var filename = fileInfo; //create the popup popup = window.open('', 'imagePreview' ,'width=620,height=530,left=100,top=75,screenX=100,screenY=75,status = 1,resizable=0'); //start writing in the html code popup.document.writeln(""); //get the extension of the file to see if it has one of the image extensions var fileExtension = filename.substring(filename.lastIndexOf(".")+1); if (fileExtension == "jpg" || fileExtension == "jpeg" || fileExtension == "gif" || fileExtension == "png") popup.document.writeln("

"); else //if not extension fron list above write URL to file popup.document.writeln("" + filename + ""); popup.document.writeln(""); popup.document.close(); popup.focus(); }