function check_contact()
{
	var alertstr="";
	alertstr;
	var setinp;
  
	if(document.mail_form.naam.value == '')
  {
    alertstr="Het veld naam moet worden ingevuld!\n";
    if(!setinp)
		{
		document.mail_form.naam.focus()
		setinp=1;
		}
  }

	if(document.mail_form.email.value == '')
  {
    alertstr=alertstr + "Het veld email moet worden ingevuld!\n";
    if(!setinp)
		{
		document.mail_form.email.focus()
		setinp=1;
		}
  }
	
	// test if valid email address, must have @ and .
    var checkEmail = "@.";
    var checkStr = mail_form.email.value;
    var EmailValid = false;
    var EmailAt = false;
    var EmailPeriod = false;
    for (i = 0;  i < checkStr.length;  i++)
    {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkEmail.length;  j++)
    {
    if (ch == checkEmail.charAt(j) && ch == "@")
    EmailAt = true;
    if (ch == checkEmail.charAt(j) && ch == ".")
    EmailPeriod = true;
    	  if (EmailAt && EmailPeriod)
    		break;
    	  if (j == checkEmail.length)
    		break;
    	}
    	// if both the @ and . were in the string
    if (EmailAt && EmailPeriod)
    {
    		EmailValid = true
    		break;
    	}
    }
		if(document.mail_form.email.value != '')
  	{
    if (!EmailValid)
    {
      alertstr=alertstr + "Ongeldige email. Veld moet een \"@\" en een \".\" hebben!\n";
      if(!setinp)
  		{
  		document.mail_form.email.focus()
  		setinp=1;
  		}
    }		
		}
	 
    if(document.mail_form.betreft.value == '')
    {
      alertstr=alertstr + "Het veld betreft moet worden ingevuld!\n";
      if(!setinp)
    		{
    		document.mail_form.betreft.focus()
    		setinp=1;
    		}
    }

		
    if(document.mail_form.vraag.value == '')
    {
      alertstr=alertstr + "Het veld bericht moet worden ingevuld!\n";
       if(!setinp)
    		{
    		document.mail_form.vraag.focus()
    		setinp=1;
    		}
    }
	  
		if (alertstr)
		{
  		alert(alertstr);
  		return (false);
		}
		
}

function openkaart()
{          
      window.open ("http://www.map4free.com/map.asp?guid=59DB8997-3391-4A02-ADE1-FF230CF2C0A2",'Locatie Rutten Becks','toolbar=no,status=yes,scrollbars=yes,location=no,menubar=no,directories=no,width=600,height=400');  
 
}

function new_product()
{          
      window.open ("edit.php?action=new",'stand','toolbar=no,status=yes,scrollbars=yes,location=no,menubar=no,directories=no,width=600,height=400');  
 
}

function info(id)
{          
      window.open ("info.php?action=view&id=" + id,'stand','toolbar=no,status=yes,scrollbars=yes,location=no,menubar=no,directories=no,width=400,height=300');  
 
}