I had the same problem, it's ain't possible.
What I used is to open a window indicating
only .jpeg or .gif is allowed and then used a javascript
to check what file was inserted in the formfield (before
uploading, not after): take a look:
<script>
extensions = new Array(".JPG",".GIF",".gif",".jpg")
function allowedExt(fileType){
var extension = fileType.substring(fileType.length-4, fileType.length)
for (var i = 0; i < extensions.length; i++) {
if (extension == extensions[i]) {
return true
break
}
}alert(errorMsg()); return false
}
function errorMsg(){
alertTxt = "Please select one of the following file types: \n\r"
for (var i = 2; i < extensions.length; i++){
alertTxt += extensions[i] + " "
{
}
}return alertTxt
}
Hope this helps.
Bye.
Michael Lugassy
Interactive Music Ltd.
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