function check_how()
{
	if(document.how.b_shape.value == "")
	{
		alert("Determine the body shape!");
		document.how.b_shape.focus();
		return false;
	}
	if(document.how.b_material.value == "")
	{
		alert("Determine the body material!");
		document.how.b_material.focus();
		return false;
	}
	if(document.how.n_material.value == "")
	{
		alert("Determine the neck material!");
		document.how.n_material.focus();
		return false;
	}
	if(document.how.f_material.value == "")
	{
		alert("Determine the fingerboard material!");
		document.how.f_material.focus();
		return false;
	}
	if(document.how.frets.value == "")
	{
		alert("Determine the quantity and type of frets!");
		document.how.frets.focus();
		return false;
	}
	if(document.how.pu_config.value == "")
	{
		alert("Determine the pickups configuration!");
		document.how.pu_config.focus();
		return false;
	}
	if(document.how.pickups.value == "")
	{
		alert("Determine the producent and model of pickups!");
		document.how.pickups.focus();
		return false;
	}
	if(document.how.controls.value == "")
	{
		alert("Determine the controls and switches!");
		document.how.controls.focus();
		return false;
	}
	if(document.how.bridge.value == "")
	{
		alert("Determine the type and producent of the bridge!");
		document.how.bridge.focus();
		return false;
	}
	if(document.how.finish.value == "")
	{
		alert("Describe the finish of the guitar!");
		document.how.finish.focus();
		return false;
	}
	if(document.how.accessories.value == "")
	{
		alert("Determine the other accessories!");
		document.how.accessories.focus();
		return false;
	}
	if(document.how.email.value == "")
	{
		alert("Put your e-mail address!");
		document.how.email.focus();
		return false;
	}
	
	
}