/* Nifty Corners Cube - rounded corners with CSS and Javascript
Copyright 2006 Alessandro Fulciniti (a.fulciniti@html.it)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

var niftyOk=(document.getElementById && document.createElement && Array.prototype.push);
var niftyCss=false;

String.prototype.find = function(what){
	return(this.indexOf(what)>=0 ? true : false);
};

var oldonload=window.onload;
if(typeof(NiftyLoad)!='function') NiftyLoad=function(){};
if(typeof(oldonload)=='function')
	window.onload=function(){oldonload();AddCss();NiftyLoad()};
else window.onload=function(){AddCss();NiftyLoad()};

function AddCss(){
niftyCss=true;
return;
var l=CreateEl("link");
l.setAttribute("type","text/css");
l.setAttribute("rel","stylesheet");
l.setAttribute("href","niftyCorners.css");
l.setAttribute("media","screen");
document.getElementsByTagName("head")[0].appendChild(l);
}

function Nifty(selector,options){
if(niftyOk==false)
	return;
if(niftyCss==false)
	AddCss();
var i,v=selector.split(","),h=0;
if(options==null)
	options="";
if(options.find("fixed-height"))
	h=getElementsBySelector(v[0])[0].offsetHeight;
for(i=0;i<v.length;i++)
	Rounded(v[i],options);
if(options.find("height"))
	SameHeight(selector,h);
}

function Rounded(selector,options){
	var i,top="",bottom="",v=new Array();
	if(options!=""){
		options=options.replace("left","tl bl");
		options=options.replace("right","tr br");
		options=options.replace("top","tr tl");
		options=options.replace("bottom","br bl");
		options=options.replace("transparent","alias");
		if(options.find("tl")){
			top="both";
			if(!options.find("tr"))
				top="left";
			}
		else if(options.find("tr"))
			top="right";
		if(options.find("bl")){
			bottom="both";
			if(!options.find("br"))
				bottom="left";
		} else if(options.find("br"))
			bottom="right";
	}
	if(top=="" && bottom=="" && !options.find("none")){
		top="both";
		bottom="both";
	}
	v=getElementsBySelector(selector);
	for(i=0;i<v.length;i++){
		FixIE(v[i]);
		if(top!="")
			AddTop(v[i],top,options);
		if(bottom!="")
			AddBottom(v[i],bottom,options);
	}
}

function AddTop(el,side,options){
	var d=CreateEl("b"),lim=4,border="",p,i,btype="r",bk,color;
	d.style.marginLeft="-"+getPadding(el,"Left")+"px";
	d.style.marginRight="-"+getPadding(el,"Right")+"px";
	if(options.find("alias") || (color=getBk(el))=="transparent"){
		color="transparent";
		bk="transparent";
		border=getParentBk(el);
		btype="t";
	} else{
		bk=getParentBk(el);
		border=Mix(color,bk);
	}
	d.style.background=bk;
	d.className="niftycorners";
	p=getPadding(el,"Top");
	if(options.find("small")){
		d.style.marginBottom=(p-2)+"px";
		btype+="s";
		lim=2;
	} else if(options.find("big")){
		d.style.marginBottom=(p-10)+"px";
		btype+="b"; lim=8;
	} else
		d.style.marginBottom=(p-5)+"px";

	for(i=1;i<=lim;i++)
		d.appendChild(CreateStrip(i,side,color,border,btype));
	el.style.paddingTop="0";
	el.insertBefore(d,el.firstChild);
}

function AddBottom(el,side,options){
	var d=CreateEl("b"),lim=4,border="",p,i,btype="r",bk,color;
	d.style.marginLeft="-"+getPadding(el,"Left")+"px";
	d.style.marginRight="-"+getPadding(el,"Right")+"px";
	if(options.find("alias") || (color=getBk(el))=="transparent"){
		color="transparent";bk="transparent"; border=getParentBk(el);btype="t";
	} else{
		bk=getParentBk(el); border=Mix(color,bk);
	}
	d.style.background=bk;
	d.className="niftycorners";
	p=getPadding(el,"Bottom");
	if(options.find("small")){
		d.style.marginTop=(p-2)+"px";
		btype+="s"; lim=2;
		}
	else if(options.find("big")){
		d.style.marginTop=(p-10)+"px";
		btype+="b"; lim=8;
		}
	else d.style.marginTop=(p-5)+"px";
	for(i=lim;i>0;i--)
		d.appendChild(CreateStrip(i,side,color,border,btype));
	el.style.paddingBottom=0;
	el.appendChild(d);
}

function CreateStrip(index,side,color,border,btype){
	var x=CreateEl("b");
	x.className=btype+index;
	x.style.backgroundColor=color;
	x.style.borderColor=border;
	if(side=="left"){
		x.style.borderRightWidth="0";
		x.style.marginRight="0";
	} else if(side=="right"){
		x.style.borderLeftWidth="0";
		x.style.marginLeft="0";
	}
	return(x);
}

function CreateEl(x){
	return(document.createElement(x));
}

function FixIE(el){
	if(el.currentStyle!=null && el.currentStyle.hasLayout!=null && el.currentStyle.hasLayout==false)
		el.style.display="inline-block";
}

function SameHeight(selector,maxh){
var i,v=selector.split(","),t,j,els=[],gap;
for(i=0;i<v.length;i++){
	t=getElementsBySelector(v[i]);
	els=els.concat(t);
	}
for(i=0;i<els.length;i++){
	if(els[i].offsetHeight>maxh) maxh=els[i].offsetHeight;
	els[i].style.height="auto";
	}
for(i=0;i<els.length;i++){
	gap=maxh-els[i].offsetHeight;
	if(gap>0){
		t=CreateEl("b");t.className="niftyfill";t.style.height=gap+"px";
		nc=els[i].lastChild;
		if(nc.className=="niftycorners")
			els[i].insertBefore(t,nc);
		else els[i].appendChild(t);
		}
	}
}

function getElementsBySelector(selector){
	var i,j,selid="";
	var selclass="";
	var tag=selector,tag2="",v2,k,f,a,s=[],objlist=[],c;
	if(selector.find("#")){ //id selector like "tag#id"
		if(selector.find(" ")){  //descendant selector like "tag#id tag"
			s=selector.split(" ");
			var fs=s[0].split("#");
			if(fs.length==1)
				return(objlist);
			f=document.getElementById(fs[1]);
			if(f){
				v=f.getElementsByTagName(s[1]);
				for(i=0;i<v.length;i++) objlist.push(v[i]);
			}
			return(objlist);
		} else{
			s=selector.split("#");
			tag=s[0];
			selid=s[1];
			if(selid!=""){
				f=document.getElementById(selid);
				if(f) objlist.push(f);
				return(objlist);
				}
			}
		}
	if(selector.find(".")){      //class selector like "tag.class"
		s=selector.split(".");
		tag=s[0];
		selclass=s[1];
		if(selclass.find(" ")){   //descendant selector like tag1.classname tag2
			s=selclass.split(" ");
			selclass=s[0];
			tag2=s[1];
			}
		}
	var v=document.getElementsByTagName(tag);  // tag selector like "tag"
	if(selclass==""){
		for(i=0;i<v.length;i++) objlist.push(v[i]);
		return(objlist);
	}
	for(i=0;i<v.length;i++){
		c=v[i].className.split(" ");
		for(j=0;j<c.length;j++){
			if(c[j]==selclass){
				if(tag2=="") objlist.push(v[i]);
				else{
					v2=v[i].getElementsByTagName(tag2);
					for(k=0;k<v2.length;k++) objlist.push(v2[k]);
					}
				}
			}
		}
	return(objlist);
	}

function getParentBk(x){
	var el=x.parentNode,c;
	while(el.tagName.toUpperCase()!="HTML" && (c=getBk(el))=="transparent")
		el=el.parentNode;

	if(c=="transparent")
		c="#FFFFFF";

	return(c);
}

function getBk(x){
var c=getStyleProp(x,"backgroundColor");
if(c==null || c=="transparent" || c.find("rgba(0, 0, 0, 0)"))
	return("transparent");
if(c.find("rgb")) c=rgb2hex(c);
return(c);
}

function getPadding(x,side){
var p=getStyleProp(x,"padding"+side);
if(p==null || !p.find("px")) return(0);
return(parseInt(p));
}

function getStyleProp(x,prop){
if(x.currentStyle)
	return(x.currentStyle[prop]);
if(document.defaultView.getComputedStyle)
	return(document.defaultView.getComputedStyle(x,'')[prop]);
return(null);
}

function rgb2hex(value){
	var hex="",v,h,i;
	var regexp=/([0-9]+)[, ]+([0-9]+)[, ]+([0-9]+)/;
	var h=regexp.exec(value);
	for(i=1;i<4;i++){
		v=parseInt(h[i]).toString(16);
		if(v.length==1)
			hex+="0"+v;
		else
			hex+=v;
	}
	return("#"+hex);
}

function Mix(c1,c2){
	var i,step1,step2,x,y,r=new Array(3);
	if(c1.length==4)
		step1=1;
	else
		step1=2;
	if(c2.length==4)
		step2=1;
	else
		step2=2;
	for(i=0;i<3;i++){
		x=parseInt(c1.substr(1+step1*i,step1),16);
		if(step1==1)
			x=16*x+x;
		y=parseInt(c2.substr(1+step2*i,step2),16);
		if(step2==1)
			y=16*y+y;
		r[i]=Math.floor((x*50+y*50)/100);
		r[i]=r[i].toString(16);
		if(r[i].length==1)
			r[i]="0"+r[i];
	}
	return("#"+r[0]+r[1]+r[2]);
}