function roll_over(img_name, img_src)
   {
   document[img_name].src = img_src;
   }
   
function validateFile()
{
	var strFile = document.getElementById("FileToUpload2").value;
	var strExt = strFile.substr(strFile.lastIndexOf('.'));
	strExt = strExt.toLowerCase();
	//alert(strExt);
	if (strExt=='.rtf' || strExt=='.pdf' || strExt=='.doc' || strExt=='.docx')
	{
		return true;
	}
	else
	{
		alert('Please upload a file with a valid extension');
		return false;
	}
}