function isCompatible() {
	if(!document.getElementById || !document.createElement) {
    	return false;
    }
    
	var b=navigator.userAgent.toLowerCase();
	if(b.indexOf("msie 5")>0 && b.indexOf("opera")==-1) {
    	return false;
    }
	return true;
}

function Rounded(selector,bk,color,size) {
	var elements=getElementsBySelector(selector);
	for(var i=0;i<elements.length;i++) {
		AddTop(elements[i],bk,color,size);
    	AddBottom(elements[i],bk,color,size);
    }
}

function RoundedTop(selector,bk,color,size) {
	var elements=getElementsBySelector(selector);
	for(var i=0;i<elements.length;i++) {
    	AddTop(elements[i],bk,color,size);
    }
}

function RoundedBottom(selector,bk,color,size) {
	var elements=getElementsBySelector(selector);
	for(var i=0;i<elements.length;i++) {
    	AddBottom(elements[i],bk,color,size);
    }
}

function AddTop(el,bk,color,size) {
	var d=document.createElement("b");
	var cn="r";
	var limit=4;
	if(size && size=="small") { 
		cn="rs"; 
		limit=2;
	}
	d.className="rtop";
	d.style.backgroundColor=bk;
	for(var i=1;i<=limit;i++){
    	var x=document.createElement("b");
    	x.className=cn + i;
    	x.style.backgroundColor=color;
    	d.appendChild(x);
    }
	el.insertBefore(d,el.firstChild);
}

function AddBottom(el,bk,color,size) {
	var d=document.createElement("b");
	var cn="r";
	var limit=4;
	if(size && size=="small"){ cn="rs"; limit=2}
	d.className="rbottom";
	d.style.backgroundColor=bk;
	for(var i=limit;i>0;i--) {
    	var x=document.createElement("b");
   	 	x.className=cn + i;
    	x.style.backgroundColor=color;
    	d.appendChild(x);
    }
	el.appendChild(d,el.firstChild);
}

function getElementsBySelector(selector){
	var s=[];
	var selid="";
	var selclass="";
	var tag=selector;
	var 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);
    	return(document.getElementById(fs[1]).getElementsByTagName(s[1]));
    }

	if(selector.indexOf("#")>0){ //id selector like "tag#id"
    	s=selector.split("#");
    	tag=s[0];
    	selid=s[1];
    }

	if(selid!=""){
    	objlist.push(document.getElementById(selid));
    	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(var i=0;i<v.length;i++){
    	if(v[i].className==selclass){
        	objlist.push(v[i]);
        }
    }
	return(objlist);
}