function validate_form ( )
{
    valid = true;

    if (document.forms[0].elements[0].value == "Search our inventory.." )
    {
        alert ("Please enter a search term.");
        valid = false;
    }
	
	if (document.forms[0].elements[0].value.length < 4) 
	{
		alert ("Our search currently supports terms over 4 characters long.");
		valid = false;
	}

    return valid;
}