function NiftyCheck(){
  if(!document.getElementById || !document.createElement)
    return(false);
  isXHTML=/html\:/.test(document.getElementsByTagName('body')[0].nodeName);
  if(Array.prototype.push==null){Array.prototype.push=function(){
      this[this.length]=arguments[0]; return(this.length);}}
  return(true);
}

function Rounded(selector,wich,bk,color,opt){
  var i,prefixt,prefixb,cn="r",ecolor="",edges=false,eclass="",b=false,t=false;

  if(color=="transparent"){
    cn=cn+"x";
    ecolor=bk;
    bk="transparent";
  }
  else if(opt && opt.indexOf("border")>=0){
    var optar=opt.split(" ");
    for(i=0;i<optar.length;i++)
      if(optar[i].indexOf("#")>=0) ecolor=optar[i];
    if(ecolor=="") ecolor="#666";
    cn+="e";
    edges=true;
  }
  else if(opt && opt.indexOf("smooth")>=0){
    cn+="a";
    ecolor=Mix(bk,color);
  }
  if(opt && opt.indexOf("small")>=0) cn+="s";
  prefixt=cn;
  prefixb=cn;
  if(wich.indexOf("all")>=0){t=true;b=true}
  else if(wich.indexOf("top")>=0) t="true";
  else if(wich.indexOf("tl")>=0){
    t="true";
    if(wich.indexOf("tr")<0) prefixt+="l";
  }
  else if(wich.indexOf("tr")>=0){
    t="true";
    prefixt+="r";
  }
  if(wich.indexOf("bottom")>=0) b=true;
  else if(wich.indexOf("bl")>=0){
    b="true";
    if(wich.indexOf("br")<0) prefixb+="l";
  }
  else if(wich.indexOf("br")>=0){
    b="true";
    prefixb+="r";
  }
  var v=getElementsBySelector(selector);
  var l=v.length;
  for(i=0;i<l;i++){
    if(edges) AddBorder(v[i],ecolor);
    if(t) AddTop(v[i],bk,color,ecolor,prefixt);
    if(b) AddBottom(v[i],bk,color,ecolor,prefixb);
  }
}

function AddBorder(el,bc){
  var i;
  if(!el.passed){
    if(el.childNodes.length==1 && el.childNodes[0].nodeType==3){
      var t=el.firstChild.nodeValue;
      el.removeChild(el.lastChild);
      var d=CreateEl("span");
      d.style.display="block";
      d.appendChild(document.createTextNode(t));
      el.appendChild(d);
    }
    for(i=0;i<el.childNodes.length;i++){
      if(el.childNodes[i].nodeType==1){
        el.childNodes[i].style.borderLeft="1px solid "+bc;
        el.childNodes[i].style.borderRight="1px solid "+bc;
      }
    }
  }
  el.passed=true;
}
    
function AddTop(el,bk,color,bc,cn){
  var i,lim=4,d=CreateEl("b");

  if(cn.indexOf("s")>=0) lim=2;
  if(bc) d.className="artop";
  else d.className="rtop";
  d.style.backgroundColor=bk;
  for(i=1;i<=lim;i++){
    var x=CreateEl("b");
    x.className=cn + i;
    x.style.backgroundColor=color;
    if(bc) x.style.borderColor=bc;
    d.appendChild(x);
  }
  el.style.paddingTop=0;
  el.insertBefore(d,el.firstChild);
}

function AddBottom(el,bk,color,bc,cn){
  var i,lim=4,d=CreateEl("b");

  if(cn.indexOf("s")>=0) lim=2;
  if(bc) d.className="artop";
  else d.className="rtop";
  d.style.backgroundColor=bk;
  for(i=lim;i>0;i--){
    var x=CreateEl("b");
    x.className=cn + i;
    x.style.backgroundColor=color;
    if(bc) x.style.borderColor=bc;
    d.appendChild(x);
  }
  el.style.paddingBottom=0;
  el.appendChild(d);
}

function CreateEl(x){
  if(isXHTML) return(document.createElementNS('http://www.w3.org/1999/xhtml',x));
  else return(document.createElement(x));
}

function getElementsBySelector(selector){
  var i,selid="",selclass="",tag=selector,f,s=[],objlist=[];

  if(selector.indexOf(" ")>0){  //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) return(f.getElementsByTagName(s[1]));
    return(objlist);
  }
  if(selector.indexOf("#")>0){ //id selector like "tag#id"
    s=selector.split("#");
    tag=s[0];
    selid=s[1];
  }
  if(selid!=""){
    f=document.getElementById(selid);
    if(f) objlist.push(f);
    return(objlist);
  }
  if(selector.indexOf(".")>0){  //class selector like "tag.class"
    s=selector.split(".");
    tag=s[0];
    selclass=s[1];
  }
  var v=document.getElementsByTagName(tag);  // tag selector like "tag"
  if(selclass=="")
    return(v);
  for(i=0;i<v.length;i++){
    if(v[i].className.indexOf(selclass)>=0){
      objlist.push(v[i]);
    }
  }
  return(objlist);
}

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);
  }
  return("#"+r[0].toString(16)+r[1].toString(16)+r[2].toString(16));
}