var openstate = 180;
var closedstate = 0;

  Window.onDomReady(function(){
   $('demandsong').addEvent('click', function(){ 
      if ($('demandbox').getStyle('height') == closedstate+'px') {
       	$('demandbox').effect('height').custom(closedstate,openstate);} 
      else {
      	$('demandbox').effect('height').custom(openstate, closedstate);} 
       });
       });