Boxchecked validation

<script language="javascript" type="text/javascript"> function submitbutton(pressbutton){ var form = document.adminForm;

 if (pressbutton == 'edit'){

if(form.boxchecked.value == 0){ alert("<?php echo JText::_( 'PLEASE SELECT A PAGE TO EDIT', true ); ?>"); } else { if(form.boxchecked.value > 1){ alert("<?php echo JText::_( 'YOU COULD EDIT ONLY ONE PAGE AT A TIME', true ); ?>"); } else { submitform( pressbutton ); return;}

       }
 } 	

if (pressbutton == 'delete'){ if(form.boxchecked.value==0){ alert("<?php echo JText::_( 'PLEASE SELECT A PAGE TO DELETE', true ); ?>"); } else {

   if(form.boxchecked.value > 1){

if ( confirm("<?php echo JText::_( 'ARE YOU SURE YOU WANT TO DELETE THESE ITEMS?' ); ?>") ){ submitform( pressbutton ); return; } else { return;} } else { if ( confirm("<?php echo JText::_( 'ARE YOU SURE YOU WANT TO DELETE THIS ITEM?' ); ?>") ){

	  submitform( pressbutton );

return; } else { return;}

       } 
   }

} if (pressbutton == 'new'){

 if(form.boxchecked.value > 0){
   alert("<?php echo JText::_( 'YOU COULD NOT HAVE A PAGE SELECTED TO CREATE ONE', true ); ?>");
   } else {
   submitform( pressbutton );
   return;}
 }

} </script>