function changeFile() {
    
    var element = document.getElementById('selectedFile');
    var fileName = document.getElementById('fileInput').value;
    
    if (fileName != '') {
    
	    var fileInputBox = document.getElementById('fileInputBox');
	    var ext = fileName.substr(fileName.lastIndexOf('.') + 1, 4);
        ext = ext.toLowerCase();
        var extension = new Array("avi", "bz2", "c", "cpp", "doc", "exe", "gif", "gz", "html", "img", "jpeg", "jpg", "js", "mp3", "mpeg", "mpg", "msi", "nfo", "pdf", "php", "png", "ppt", "psd", "rar", "rtf", "swf", "txt", "wav", "wma", "wmv", "xls", "zip");
	    if (extension.indexOf(ext) > 0) {}
	    else {ext = 'unknown';}

	    element.style.paddingLeft = '25px';
	    element.style.background = 'url(../images/icons/' + ext + '.png) no-repeat 3px 2px';
	    var filteredName = fileName.substr(fileName.lastIndexOf('/') + 1);
	    filteredName = fileName.substr(fileName.lastIndexOf('\\') + 1);
	    if (filteredName.length > 30)
	      filteredName = filteredName.substr(0, 30) + ' ...'; 
	    element.innerHTML = filteredName;
	    
	}
  }

  function changeAsc() {
  	if (document.getElementById('hiddenAsc').value == 'ASC') 
  		document.getElementById('hiddenAsc').value = 'DESC';
  	else
  		document.getElementById('hiddenAsc').value = 'ASC';
  }