function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false;}
else {return true}
}
}function validate_form(thisform)
{
with (thisform)
{
if (validate_required(name,"Name must be filled out!")==false)
  {name.focus();return false;}

if (validate_required(telephone,"Telephone number must be filled out!")==false)
  {telephone.focus();return false;}

if (validate_required(date,"Email must be filled out!")==false)
  {date.focus();return false;}
 
if (validate_required(time,"Email must be filled out!")==false)
  {time.focus();return false;}

}
}