$(document).ready(function(){

    $('.scroll_up').click(function(){
	var id = this.id.replace('_up', "");
	
	var x = parseInt($('.'+id).css('top'), 10);
	if(x<0) { 
    $('.'+id).animate({"top": "+=100px"}, "medium");
	  }
    });

  $('.scroll_down').click(function(){

	var id = this.id.replace('_dw', "");
								   
    $('.'+id).animate({"top": "-=100px"}, "medium");
    });

});


	  
		

<!-- Initialize each slider on the page. Each slider must have a unique id -->
	
jQuery(window).bind("load", function() {
			jQuery("div#slider1").codaSlider()
			// jQuery("div#slider2").codaSlider()
			// etc, etc. Beware of cross-linking difficulties if using multiple sliders on one page.
});