function RemoveBad(strTemp) { 
    strTemp = strTemp.replace(/\<|\>|\"|\'|\%|\;|\$|\~|\`|\^/g,""); 
    return strTemp;
} 

function stringFilter(input)  {
s = RemoveBad(input.value);
filteredValues = "{,},~,`,$,%,^,&,(,),\",',@";     // Characters stripped out
var i;
var returnString = "";
for (i = 0; i < s.length; i++) {  // Search through string and append to unfiltered values to returnString.
var c = s.charAt(i);
if (filteredValues.indexOf(c) == -1) returnString += c;
}
input.value = returnString;
}


extArray  =  new  Array(".mp3");

function LimitAttach(form, file) {
allowSubmit = false;
if (!file) return;
while (file.indexOf("\\") != -1)
file = file.slice(file.indexOf("\\") + 1);
ext = file.slice(file.indexOf(".")).toLowerCase();
for (var i = 0; i < extArray.length; i++) {
if (extArray[i] == ext) { allowSubmit = true; break; }
}
if (allowSubmit) {
 return true;
 } else {
  alert("Please only upload MP3 files!");
  return false;
  }
}