// form validerings-funktioner
// af Finn Gehrcke, juni 2010

// checkcheckbox(field,alerttxt)
// checkdropdown(field,alerttxt)
// checkemail(field,alerttxt)
// checkradio(field,alerttxt)
// checktextfield(field,alerttxt)

function checkcheckbox(field,alerttxt)
{
     with (field)
     {
          if (checked == false)
          {
               alert(alerttxt);return false;
          }
          else
          {
               return true;
          }
     }
}

function checkdropdown(field,alerttxt)
{
     with (field)
     {
          if (selectedIndex < 1)
          {
               alert(alerttxt);return false;
          }
          else
          {
               return true;
          }
     }
}

function checkemail(field,alerttxt)
{
     with (field)
     {
          apos=value.indexOf("@");
          dotpos=value.lastIndexOf(".");
          if (apos<1||dotpos-apos<2)
          {
               alert(alerttxt);
               return false;
          }
          else 
          {
               return true;
          }
     }
}

function checkradio(field,alerttxt)
{
     radioSelected = false;
     with (field)
     {
          for (n=0;n<length; n++) 
          {
               if (field[n].checked)
               {
                    radioSelected=true;
               }
          }
          if (radioSelected == false)
          {
               alert(alerttxt);
               return false;
          }
          else
          {
               return true;
          }
     }
}

function checktextfield(field,alerttxt)
{
     with (field)
     {
          if (value==null||value=="")
          {
               alert(alerttxt);
               return false;
          }
          else
          {
               return true;
          }
     }
}

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