/**
  * RUZEE.ShadedBorder 0.2
  * (c) 2006 Steffen Rusitschka
  *
  * RUZEE.ShadedBorder is freely distributable under the terms of an MIT-style license.
  * For details, see http://www.ruzee.com/
  */
 
 var RUZEE = window.RUZEE || {};
 
 RUZEE.ShadedBorder = {
 
 create: function(opts) {
   var isie = /msie/i.test(navigator.userAgent) && !window.opera;
   function sty(el, h) {
     for(k in h) {
       if (/ie_/.test(k)) {
         if (isie) el.style[k.substr(3)]=h[k];
       } else el.style[k]=h[k];
     }
   }
   function crdiv(h) {
     var el=document.createElement("div");
     el.className = "sb-gen";
     sty(el, h);
     return el;
   }
   function op(v) {
     v = v<0 ? 0 : v;
     v = v>0.99999 ? 0.99999 : v;
     if (isie) {
       return " filter:alpha(opacity=" + (v*100) + ");";
     } else {
       return " opacity:" + v + ';';
     }
   }
 
   var sr = opts.shadow || 0;
   var r = opts.corner || 0;
   var bor = 0;
   var bow = opts.border || 0;
   var shadow = sr != 0;
   var lw = r > sr ? r : sr;
   var rw = lw;
   var th = lw;
   var bh = lw;
   if (bow > 0) {
     bor = r;
     r = r - bow;
   }
   var cx = r != 0 && shadow ? Math.round(lw/3) : 0;
   var cy = cx;
   var cs = Math.round(cx/2);
   var iclass = r > 0 ? "sb-inner" : "sb-shadow";
   var sclass = "sb-shadow";
   var bclass = "sb-border";
   var edges = opts.edges || "trlb";
   if (!/t/i.test(edges)) th=0;
   if (!/b/i.test(edges)) bh=0;
   if (!/l/i.test(edges)) lw=0;
   if (!/r/i.test(edges)) rw=0;
 
   var p = { position:"absolute", left:"0", top:"0", width:lw + "px", height:th + "px", 
             ie_fontSize:"1px", overflow:"hidden" }; var tl = crdiv(p);
   delete p.left; p.right="0"; p.width=rw + "px"; var tr = crdiv(p);
   delete p.top; p.bottom="0"; p.height=bh + "px"; var br = crdiv(p);
   delete p.right; p.left="0"; p.width=lw + "px"; var bl = crdiv(p);
 
   var tw = crdiv({ position:"absolute", width:"100%", height:th + "px", ie_fontSize:"1px",
                    top:"0", left:"0", overflow:"hidden" });
   var t = crdiv({ position:"relative", height:th + "px", ie_fontSize:"1px", marginLeft:lw + "px",
                   marginRight:rw + "px", overflow:"hidden" });
   tw.appendChild(t);
 
   var bw = crdiv({ position:"absolute", left:"0", bottom:"0", width:"100%", height:bh + "px", 
                    ie_fontSize:"1px", overflow:"hidden" });
                    
   var b = crdiv({ position:"relative", height:bh + "px", ie_fontSize:"1px", marginLeft:lw + "px",
                   marginRight:rw + "px", overflow:"hidden" });
                   
   bw.appendChild(b);
 
   var mw = crdiv({ position:"absolute", top:(-bh)+"px", left:"0", width:"100%", height:"100%",
                    overflow:"hidden", ie_fontSize:"1px" });
 
   function corner(el,t,l) {
     var w = l ? lw : rw;
     var h = t ? th : bh;
     var s = t ? cs : -cs;
     var dsb = []; var dsi = []; var dss = [];
     
     var xp=0; var xd=1; if (l) { xp=w-1; xd=-1; }
     for (var x=0; x<w; ++x) {
       var yp=0; var yd=1; if (t) { yp=h-1; yd=-1; }
       for (var y=0; y<h; ++y) {
         var div = '<div style="position:absolute; top:' + yp + 'px; left:' + xp + 'px; ' +
                   'width:1px; height:1px; overflow:hidden;';
 
         var xc = x - cx; var yc = y - cy - s;
         var d = Math.sqrt(xc*xc+yc*yc);
         var doShadow = false;
 
         if (r > 0) {
           // draw border
           if (xc < 0 && yc < bor && yc >= r || yc < 0 && xc < bor && xc >= r) {
             dsb.push(div + '" class="' + bclass + '"></div>');
           } else
           if (d<bor && d>=r-1 && xc>=0 && yc>=0) {
             var dd = div;
             if (d>=bor-1) {
               dd += op(bor-d);
               doShadow = true;
             }
             dsb.push(dd + '" class="' + bclass + '"></div>');
           }
           
           // draw inner
           var dd = div + ' z-index:2;';
           if (xc < 0 && yc < r || yc < 0 && xc < r) {
             dsi.push(dd + '" class="' + iclass + '"></div>');
           } else
           if (d<r && xc>=0 && yc>=0) {
             if (d>=r-1) {
               dd += op(r-d);
               doShadow = true;
             }
             dsi.push(dd + '" class="' + iclass + '"></div>');
           } else doShadow = true;
         } else doShadow = true;
         
         // draw shadow
         if (sr > 0 && doShadow) {
           d = Math.sqrt(x*x+y*y);
           if (d<sr) {
             dss.push(div + ' z-index:0; ' + op(1-(d/sr)) + '" class="' + sclass + '"></div>');
           }
         }
         yp += yd;
       }
       xp += xd;
     }
     el.innerHTML = dss.concat(dsb.concat(dsi)).join('');
   }
   
   function mid(mw) {
     var ds = [];
 
     ds.push('<div style="position:relative; top:' + (th+bh) + 'px;' +
             ' height:10000px; margin-left:' + (lw-r-cx) + 'px;' +
             ' margin-right:' + (rw-r-cx) + 'px; overflow:hidden;"' +
             ' class="' + iclass + '"></div>');
 
     var dd = '<div style="position:absolute; width:1px;' +
         ' top:' + (th+bh) + 'px; height:10000px;';
     for (var x=0; x<lw-r-cx; ++x) {
       ds.push(dd + ' left:' + x + 'px;' + op((x+1.0)/lw) + 
           '" class="' + sclass + '"></div>');
     }
 
     for (var x=0; x<rw-r-cx; ++x) {
       ds.push(dd + ' right:' + x + 'px;' + op((x+1.0)/rw) + 
           '" class="' + sclass + '"></div>');
     }
 
     if (bow > 0) {
       var su = ' width:' + bow + 'px;' + '" class="' + bclass + '"></div>';
       ds.push(dd + ' left:' + (lw-bor-cx) + 'px;' + su);
       ds.push(dd + ' right:' + (rw-bor-cx) + 'px;' + su);
     }
 
     mw.innerHTML = ds.join('');
   }
 
   function tb(el, t) {
     var ds = [];
     var h = t ? th : bh;
     var dd = '<div style="height:1px; overflow:hidden; position:absolute;' +
         ' width:100%; left:0px; ';
     var s = t ? cs : -cs;
     for (var y=0; y<h-s-cy-r; ++y) {
       ds.push(dd + (t ? 'top:' : 'bottom:') + y + 'px;' + op((y+1)*1.0/h) + 
           '" class="' + sclass + '"></div>');
     }
     if (y >= bow) {
       ds.push(dd + (t ? 'top:' : 'bottom:') + (y - bow) + 'px;' +
           ' height:' + bow + 'px;" class="' + bclass + '"></div>');
     }
 
     ds.push(dd + (t ? 'top:' : 'bottom:') + y + 'px;' +
         ' height:' + (r+cy+s) + 'px;" class="' + iclass + '"></div>');
 
     el.innerHTML = ds.join('');
   }
 
   corner(tl, true, true); corner(tr, true, false);
   corner(bl, false, true); corner(br, false, false);
   mid(mw); tb(t, true); tb(b, false);
 
   return {
     render: function(el) {
       if (typeof el == 'string') el = document.getElementById(el);
       if (el.length != undefined) {
         for (var i=0; i<el.length; ++i) this.render(el[i]);
         return;
       }
       // remove generated children
       var node = el.firstChild;
       while (node) {
         var nextNode = node.nextSibling;
         if (node.nodeType == 1 && node.className == 'sb-gen')
           el.removeChild(node);
         node = nextNode;
       }
 
       var iel = el.firstChild;
 
       var twc = tw.cloneNode(true);
       var mwc = mw.cloneNode(true);
       var bwc = bw.cloneNode(true);
       
       el.insertBefore(tl.cloneNode(true), iel); el.insertBefore(tr.cloneNode(true), iel);
       el.insertBefore(bl.cloneNode(true), iel); el.insertBefore(br.cloneNode(true), iel);
       el.insertBefore(twc, iel); el.insertBefore(mwc, iel);
       el.insertBefore(bwc, iel);
 
       if (isie) {
         function resize() {
           twc.style.width = bwc.style.width = mwc.style.width = el.offsetWidth + "px";
           mwc.firstChild.style.height = el.offsetHeight + "px";
         }
         el.onresize=resize;
         resize();
       }
     }
   };
 }
 }
 
 // add our styles to the document
 document.write(
   '<style type="text/css">' +
   '.sb, .sbi, .sb div, .sbi div { position:relative; z-index:1; }' +
   '* html .sb, * html .sbi { height:1%; }' +
   '.sbi { display:inline-block; }' +
   '.sb-inner { background:#ddd; }' +
   '.sb-shadow { background:#000; }' +
   '.sb-border { background:#bbb; }' +
   '</style>'
 );