/* medical-id-tags-scroller.js */
/*<![CDATA[*/

function autoscroll(e){
    var mousx = 0;
	var mousy = 0;
	var doid=this.id;
	var dobj=document.getElementById(doid);
	if (!e) {
		var e = window.event;
	}
	if (e.pageX || e.pageY){
		mousx = e.pageX;
		mousy = e.pageY;
	} else if (e.clientX || e.clientY) {
		mousx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
		mousy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
	}
	 
	var offx = 0;
	var offy = 0;
	while(dobj) {
		// calculate the actual x&y offsets of the element to be scrollled
		offx+=dobj.offsetLeft;
		offy+=dobj.offsetTop;
		dobj=dobj.offsetParent;
	}
 
	relx=mousx-offx; // Relative mouse positions wrt the element
	rely=mousy-offy;
	dobj=document.getElementById(doid);
	var margn=dobj.offsetWidth/10;
	if(relx<margn) { 
		relx=margn;
	}
	if(relx > (dobj.offsetWidth-margn)) {
		relx=dobj.offsetWidth-margn;
	}
	dobj.finy=parseInt(( dobj.scrollHeight - dobj.offsetHeight ) * (rely-margn) / (dobj.offsetHeight-2*margn));
	dobj.finx=parseInt(( dobj.scrollWidth - dobj.offsetWidth ) * (relx-margn) / (dobj.offsetWidth-2*margn));
	if(!dobj.speedy && !dobj.speedx) { 
		// If not already scrolling 
		dobj.speedy=0;
		dobj.speedx=0;
		scrollToFin(doid);
	}
}
 
function scrollToFin(oid){ 
	obj=document.getElementById(oid);
	obj.speedy=((obj.finy-obj.scrollTop)/8+obj.speedy)/2; // it tries to bring speed gradually to (distance/4) ......
	obj.speedx=((obj.finx-obj.scrollLeft)/8+obj.speedx)/2;
	
	if(Math.abs(obj.scrollTop-obj.finy) < 1 ) {
		obj.scrollTop=obj.finy;
		obj.speedy=null;
	} else obj.scrollTop+=parseFloat(obj.speedy);
 
	if(Math.abs(obj.scrollLeft-obj.finx) < 1 ) {
		obj.scrollLeft=obj.finx;
		obj.speedx=null;
	} else obj.scrollLeft+=parseFloat(obj.speedx);
	
	if(obj.scrollTop!=obj.finy || obj.scrollLeft!=obj.finx) {
		setTimeout("scrollToFin('"+oid+"')",18);
	} else {
		obj.speedy=null;
		obj.speedx=null;
	}
}
/*]]>*/