/*		Vertical slider script.
	 		Author: 	Richard Kosik  
 	 		Date:			8 June 2003
	 
	 		Copyright ilecDesign 2003.
*/	
var ua=navigator.userAgent;
var OPERA=(ua.indexOf("Opera")>0);
var OMNI=(ua.indexOf("Omni")>0);
var IE5,IE6,NS6;
var px;

if(!OPERA&&!OMNI){IE6=(ua.indexOf("MSIE 6")>0);IE5=(ua.indexOf("MSIE 5")>0||IE6);NS6=(ua.indexOf("Gecko")>0);px="px";}
else px=0;window.sliders=new Array();

function VSlider(id){var el=document.getElementById(id);this.el=el;this.id=el.id;this.origTop=this.getTop();if(el.style.top=="")el.style.top=(typeof this.origTop=="number")?this.origTop+px:(el.offsetTop-1)+px;this.isIdle=true;window.sliders[this.id]=this;this.animString="sliders."+this.id+".updatePosition();";this.slideTimer=setInterval(this.animString,54);}
VSlider.prototype={updatePosition:
function(){viewTop=getScrollTop();if(!viewTop)viewTop=0;var elTop=this.getTop();var idlePos=viewTop+this.origTop;var dy=Math.round((Math.abs(idlePos-elTop)/4)+.25);if(idlePos<elTop)dy=-dy;this.moveTo(elTop,dy);this.prepareUpdate(idlePos,viewTop);},moveTo:
function(curr,i){this.el.style.top=(curr+i)+px;},prepareUpdate:
function(idlePos,viewTop){var elTop=this.getTop();if(idlePos==elTop){if(!this.isIdle){clearInterval(this.slideTimer);this.onSlideEnd();this.slideTimer=setInterval(this.animString,400);this.isIdle=true;}
}
else if(this.isIdle){clearInterval(this.slideTimer);this.onSlideStart();if(elTop+this.el.offsetHeight<viewTop+this.origTop)this.el.style.top=(viewTop-this.el.offsetHeight)+px;else{viewBottom=viewTop+getViewportHeight();if(elTop>viewBottom)this.el.style.top=viewBottom+px;}
this.slideTimer=setInterval(this.animString,54);this.isIdle=false;}
},onSlideStart:
function(){},onSlideEnd:
function(){},getTop:
function(){if(typeof this.el.offsetTop=="number")return this.el.offsetTop;return this.el.style.pixelTop;}};
function getScrollTop(){if(NS6||OPERA)return window.pageYOffset;if(IE6)return Math.max(document.documentElement.scrollTop,document.body.scrollTop);return document.body.scrollTop;}
function getViewportHeight(){if(NS6||OPERA)return window.innerHeight-16;if(IE6)return Math.max(document.documentElement.clientHeight,document.body.clientHeight);return document.body.clientHeight-2;}