/*
 * AutoScroll Plugin for jQuery
 *
 * Copyright (c) 2006 Jonathan Sharp (jdsharp.us)
 * Licensed under the GPL license.
 *
 * http://jdsharp.us/code/AutoScroll/
 *
 * Date: 2006-09-19
 * Rev: 002
 */

	$.autoscroll = {
	   settings:   {},
	   interval:   0,
	   event:      null,

	   init: function(opts) {
	      $.autoscroll.settings = {
	         step:       80,
	         trigger: 75,
	         interval:   500,
	         mod_key:    17
	      };

	      if (opts) {
	         for (o in opts) {
	            $.autoscroll.settings[o] = opts[o];
	         }
	      }

	      document.onmousemove= $.autoscroll.setMouseEvent;
	      if ( $.autoscroll.settings.mod_key === false ) {
	         $.autoscroll.start();

	      } else {
	         document.onkeydown   = $.autoscroll.setKeyEvent;
	         document.onkeyup  = $.autoscroll.stop;
	      }
	   },

	   start: function(e) {
	      $.autoscroll.interval = setInterval($.autoscroll.step, $.autoscroll.settings.interval);
	   },

	   stop: function(e) {
	      clearInterval($.autoscroll.interval);
	      $.autoscroll.interval = 0;
	   },

	   setKeyEvent: function(e) {
	      var e = e || window.event;
	      var k = e.charCode ? e.charCode : e.keyCode ? e.keyCode : e.which;
	      if ($.autoscroll.interval == 0 && ($.autoscroll.settings.mod_key == k || $.autoscroll.settings.mod_key === false)) {
	         $.autoscroll.start();
	      }
	   },

	   setMouseEvent: function(e) {
	      var e = e || window.event;
	      var de   = document.documentElement;
	      var b = document.body;
	      $.autoscroll.event = {
	         cursor: {
	            x: e.pageX || (e.clientX + (de.scrollLeft || b.scrollLeft) - (de.clientLeft || 0)),
	            y: e.pageY || (e.clientY + (de.scrollTop || b.scrollTop) - (de.clientTop || 0))
	         },

	         win: {
	            w: window.innerWidth  || (de.clientWidth && de.clientWidth != 0 ? de.clientWidth : b.offsetWidth),
	            h: window.innerHeight || (de.clientHeight && de.clientWidth != 0 ? de.clientHeight : b.offsetHeight)
	         },

	         scroll: {
	            x: (document.all ?
	                  (!de.scrollLeft ? b.scrollLeft : de.scrollLeft)
	                  :
	                  (window.pageXOffset ? window.pageXOffset : window.scrollX)
	                  ),
	            y: (document.all ?
	                  (!de.scrollTop ? b.scrollTop : de.scrollTop)
	                  :
	                  (window.pageYOffset ? window.pageYOffset : window.scrollY)
	                  )
	         }
	      };
	   },

	   step: function() {
	      var e = $.autoscroll.event;
	      if (!e) {
	         return;
	      }

	      var hot_l   = e.scroll.x;
	      var hot_r   = e.scroll.x + e.win.w;
	      var x    = e.cursor.x;

	      var hot_t   = e.scroll.y;
	      var hot_b   = e.scroll.y + e.win.h;
	      var y       = e.cursor.y;

	      if (hot_l <= x && x <= (hot_l + $.autoscroll.settings.trigger)) {
	         var ratio   = (1 - ((x - hot_l) / $.autoscroll.settings.trigger));
	         var step = Math.round(ratio * $.autoscroll.settings.step, 0);
	         e.scroll.x += -step;
	         e.cursor.x += -step;
	      } else if ((hot_r - $.autoscroll.settings.trigger) <= x && x <= hot_r) {
	         var ratio   = (1 - ((hot_r - x) / $.autoscroll.settings.trigger));
	         var step = Math.round(ratio * $.autoscroll.settings.step, 0);
	         e.scroll.x += step;
	         e.cursor.x += step;
	      }

	      if (hot_t <= y && y <= (hot_t + $.autoscroll.settings.trigger)) {
	         var ratio   = (1 - ((y - hot_t) / $.autoscroll.settings.trigger));
	         var step = Math.round(ratio * $.autoscroll.settings.step, 0);
	         e.scroll.y += -step;
	         e.cursor.y += -step;
	      } else if ((hot_b - $.autoscroll.settings.trigger) <= y && y <= hot_b) {
	         var ratio   = (1 - ((hot_b - y) / $.autoscroll.settings.trigger));
	         var step = Math.round(ratio * $.autoscroll.settings.step, 0);
	         e.scroll.y += step;
	         e.cursor.y += step;
	      }

	      if (e.scroll.x < 0) {
	         e.scroll.x = 0;
	         e.cursor.x = 0;
	      }
	      if (e.scroll.y < 0) {
	         e.scroll.y = 0;
	         e.cursor.y = 0;
	      }

	            window.scrollTo(e.scroll.x, e.scroll.y);

	         // ab hier von mir
	         /*if (document.getElementById('debugform').scrollto_autoscroll_action.value == 'autoscroll allowed'){
					//		window.scrollTo(e.scroll.x, e.scroll.y);
				}		
			*/

	   }
	};