jQuery(document).ready(function(){
	var main_height = $('.p_main').height();
	var doc_height = $(document).height();
	var main_otstup = (doc_height-main_height)/2;
	$('.p_main').css({top: main_otstup});
});

function toggleBlock(id)
{
	$('#'+id).toggle();
	//$('#globback').css({height: '100%'});
	return false;
}