function previewImage(fileInfo) {
var filename = "";
//create the path to your local file
if (fileInfo == null) {
if (document.form1.file != "") {
filename = "file:///" + document.form1.file.value;
}
} else {
filename = fileInfo;
}
//check if there is a value
if (filename == "") {
alert ("Please select a image.");
document.form1.file.focus();
} else {
//create the popup
popup = window.open('', 'imagePreview', )width=600,height=450,left=100,top=75,
screenX=100,screenY=75,scrollbars,location,menubar,status,toolbar,resizable=1');
//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("![](" + filename + ")
");
else
//if not extension fron list above write URL to file
popup.document.writeln("" + filename + "");
popup.document.writeln("");
popup.document.close();
popup.focus();
}
}