function trimString( s )
{
   var index = s.length;
   while( index > 0 && ( c = s.charAt( index - 1 ) ) != null )
   {
      if( c == ' ' || c == '\t' )
      {
         index--;
      }
      else
      {
         break;
      }
   }
   
   s = s.substring( 0 , index );
   
   index = 0;
   while( ( c = s.charAt( index ) ) != null )
   {
      if( c == ' ' || c == '\t' )
      {
         index++;
      }
      else
      {
         break;
      }
   }
   
   return s.substring( index , s.length );
}

function testHeltal( s )
{
   s = trimString ( s ) ;
   
   for( var i = 0; i < s.length; i++)
   {
	  if(s.charAt(i) == "." || s.charAt(i) == ",") {
	  	 alert("Undlad venligst at bruge tusindtalsseperatorer.");
		 return false;
	  }
      if( s.charAt( i ) < "0" || s.charAt( i ) > "9" )
      {
         return false;
      }
   }
   
   return true;
}
/*
 @routine activeClearForm
 @date 27.jan. 2009
 @author PY
 @desc
 Clear form-element
 @enddesc
 */
function activeClearForm(el) {
    if (el.defaultValue == el.value) {
        el.value = "";
    }
}
/*
 @routine validateEmail
 @date 27.jan. 2009
 @author PY
 @desc
 Validate text to ensure valid email-address
 @enddesc
 @par		txtboxUsername
 @pdesc   	set to text that needs validating
 @ptype   	textbox
 @endpar
 @par		errorMessage
 @pdesc   	set to text that should appear if email is invalid
 @ptype   	string
 @endpar
 */
var emailregexp = /^([A-Z0-9_\.\-]+)@([A-Z0-9]+)([.,_,-]([A-Z0-9]+))*\.[A-Z]{2,4}$/i;
function validateEmail(txtboxUsername, errorMessage) {
    if (!emailregexp.test(txtboxUsername.value)) {
        txtboxUsername.value = errorMessage;
        return false;
    }
    return true;
}