function IsEmpty( text )
{
    if( text.value.length == 0 ) 
        return( true );
    for( var i=0; i<text.value.length; ++i )  
    {
        var ch = text.value.charAt(i);
        if( ch != ' ' && ch != '\t' ) 
            return( false );
    }
    return( true );
}


function IsEmail( text )
{
    if( text.value.length == 0 ) 
        return( false );
    if( text.value.indexOf("@") == -1 || text.value.indexOf(".") == -1 )
        return( false );
    return( true );
}

function ValidateContactForm(F)
{
    if ( IsEmpty(F.txtName) )
        {
        alert("Please enter your name.");
        F.txtName.focus();
        }
    else 
	if ( IsEmpty(F.txtEmail) || !IsEmail(F.txtEmail) )
        {
        alert("Please enter a valid e-mail address.");
        F.txtEmail.focus();
        }
    else 
	if ( IsEmpty(F.txtCompany) )
        {
        alert("Please enter your company.");
        F.txtCompany.focus();
        }
    else 
	if ( IsEmpty(F.txtAddress) )
        {
        alert("Please enter your street address.");
        F.txtAddress.focus();
        }
    else
	if ( IsEmpty(F.txtCity) )
        {
        alert("Please enter your city.");
        F.txtCity.focus();
        }
    else 
	if ( IsEmpty(F.txtZip) )
        {
			alert("Please enter your zip.");
			F.txtZip.focus();
        }
    else
	if ( IsEmpty(F.txtCountry) )
		{
			alert("Please enter your country.");
		}
	else
		if ( IsEmpty(F.txtPhone) )
		{
			alert("Please enter your phone number.");
		}
	else
  
    return( true );
    
    return( false );
}