var scroll_increment = 75;

var scroll_up_interval_id = null;
var scroll_down_interval_id = null;

function text_body_scroll_up() {
	if(parseInt($('#text_body').css('top')) > 0 ) {
		return;
	}
	var new_top = (parseInt($('#text_body').css('top')) + scroll_increment);
	if(new_top > 0) new_top = 0;
	var expr = "$('#text_body').animate({top: "+new_top+"}, 1000);";
	eval(expr);
}
function text_body_scroll_down() {
	if((parseInt($('#text_body').css('top'))+parseInt($('#text_body').css('height'))) <  parseInt($('#body_container').css('height'))) {
		return;
	}
	var expr = "$('#text_body').animate({top: "+(parseInt($('#text_body').css('top')) - scroll_increment)+"}, 1000);";
	//alert('scroll down!!!!!!!!! '+expr);
	eval(expr);
}
$(document).ready(
    function() {
      $('#scroll_up').click(
		  function() {
			text_body_scroll_up();
		  }
      );
      $('#scroll_down').click(
        function() {
			text_body_scroll_down()        }
      );
	  
      $('#scroll_up').hover(
		  function() {
			scroll_up_interval_id = setInterval("text_body_scroll_up();", 900);
		  },
		  function() {
			  if(scroll_up_interval_id != null)
				  clearInterval(scroll_up_interval_id);
			  scroll_up_interval_id = null;
		  }
      );
      $('#scroll_down').hover(
		  function() {
			scroll_down_interval_id = setInterval("text_body_scroll_down( );", 900);
		  },
		  function() {
			  if(scroll_down_interval_id != null)
				  clearInterval(scroll_down_interval_id);
			  scroll_down_interval_id = null;
		  }
      );
	  
	  $('#menu_items li').hover(
		  function() {
			  $(this).css('font-size', '140%');
			  $(this).css('font-weight', 'bold');
		  },
		  function() {
			  $(this).css('font-size', '100%');
			  $(this).css('font-weight', 'none');
		  }
	  );

    }
);