/* Nifty Corners Cube - rounded corners with CSS and Javascript
*/

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;
	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="",selclass="",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]);
}