jQuery.fn.mousehold = function(timeout, f) {
if (timeout && typeof timeout == 'function') {
	f = timeout;
	timeout = 100;
}
if (f && typeof f == 'function') {
	var timer = 0;
	var fireStep = 0;
	return this.each(function() {
		jQuery(this).mousedown(function() {
			fireStep = 1;
			var ctr = 0;
			var t = this;
			timer = setInterval(function() {
				ctr++;
				f.call(t, ctr);
				fireStep = 2;
			}, timeout);
		})

		clearMousehold = function() {
			clearInterval(timer);
			if (fireStep == 1) f.call(this, 1);
			fireStep = 0;
		}
		
		jQuery(this).mouseout(clearMousehold);
		jQuery(this).mouseup(clearMousehold);
	})
}
}	 


$(document).ready(function(){	
  
 $("#scrolldown").mousehold(100, function(i){  
		  $.scrollTo( '+=100', 100);				  
 });
 
 $("#scrollup").mousehold(100, function(i){  
		  $.scrollTo( '-=100', 100);}
 );
});