ÿþ< s c r i p t   l a n g u a g e = " J a v a S c r i p t " > < ! - -  
 f u n c t i o n   V a l i d a t e ( f o r m )   {  
     v a r   c n   =   f o r m . c n . v a l u e ;  
     v a r   p o s   =   0 ;  
     v a r   o k   =   t r u e ;  
     w h i l e   ( p o s   <   c n . l e n g t h )   {  
         i f   ( ( c n . c h a r A t ( p o s )   <   ' 0 ' )   | |   ( c n . c h a r A t ( p o s )   >   ' 9 ' ) )   {  
             c n   =   c n . s l i c e ( 0 ,   p o s )   +   c n . s l i c e ( p o s + 1 ,   c n . l e n g t h ) ;  
             o k   =   f a l s e ;  
         }   e l s e  
             p o s + + ;  
     }  
     f o r m . c n . v a l u e   =   c n ;  
     i f   ( ! o k )  
         o k   =   c o n f i r m ( ' N u m r e t   d u   s k r e v   i n   h a r   o g i l t i g a   t e c k e n .   Ä r   " '  
             +   c n   +   ' "   n u m r e t   d u   v i l l   a t t   v i   s k a l l   r i n g a ? ' ) ;  
     i f   ( o k )   {  
         i f   ( ( c n . l e n g t h   <   7 ) | | ( c n . l e n g t h   >   1 5 ) )  
                 a l e r t ( " N u m r e t   d u   a n g i v i t   i n n e h & a r i n g ; l l e r   f ö r   f & a r i n g ;   e l l e r   f ö r   m & a r i n g ; n g a   s i f f r o r .   \ n \ n   K o n t r o l l e r a   n u m r e t   o c h   f ö r s ö k   i g e n . " )  
         e l s e  
                 r e t u r n   t r u e ;  
     }  
     r e t u r n   f a l s e ;  
 }  
 / /   - - >  
 < / s c r i p t > 
