function change_month( month )
	{
	url = "moduly/kalendarz.php?month=" + month ; 
  new Ajax(url, {method: 'get' , update : $('main_call') } ).request();	
	}

function displayWindow(url, width, height){
var Win = window.open(url,"displayWindow",'width=' + width + ',height=' + height + ',top=30,left=100,resizable=yes,scrollbars=yes,menubar=no');
}