// JScript File

function ValidateEmail(str) 
{
	var at="@", dot=".";
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	
	if (str.indexOf(at)==-1) return false;
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr) return false;
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr) return false;
	if (str.indexOf(at,(lat+1))!=-1) return false;
    if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot) return false;
	if (str.indexOf(dot,(lat+2))==-1) return false;
	if (str.indexOf(" ")!=-1) return false;

    return true;
}

function CheckUploadFileExtensions(filename, extensions)
{
    for (var ii=0; ii < extensions.length; ii++)
        if (filename.length >= extensions[ii].length)
            if (filename.substr(filename.length - extensions[ii].length, extensions[ii].length).toLowerCase() == extensions[ii].toLowerCase())
                return true;
    
    return false;
}

function CheckUploadFileExtension(filename, extensions)
{
    return CheckUploadFileExtensions(filename, extensions.split(','));
}

function CheckUploadFileExtensionFromTextBox(textbox, extensions)
{
    var filename = $get(textbox);
    if (filename)
        return CheckUploadFileExtension(filename.value, extensions)
        
    return false;
}