function playWindow(divid){
		if(document.getElementById(divid).style.visibility == "visible"){
			document.getElementById(divid).style.visibility = "hidden";
		}
		else{
			document.getElementById(divid).style.visibility = "visible"
		}		
	}
	function unicode(s){
 		var len=s.length;
 		var rs="";
 		for(var i=0;i<len;i++){
 			var k=s.substring(i,i+1);
 			rs+="&#"+s.charCodeAt(i)+";";
 		}
 		return rs;
} 
var b64ch = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
function base64Decode(b64)
{
   var i, j, k;
   var c = [0,0,0,0];
   var uba = []; // unicode byte array
   var ucs = ""; // unicode string
   var ch; // single character
   for (j=k=0; ; ) {
     for (i=0; i<4 && k<b64.length; k++) {
     ch = b64.charAt(k);
     switch (ch) {
     case '=' : c[i] = 0; break;
     case '\r':
     case '\n': continue;
     default:
     c[i++] = b64ch.indexOf(ch);
     }
     }
     uba.length += 3;
     if (i>0) uba[j++] = (c[0] << 2 | c[1] >>> 4) & 0xff;
     if (i>1) uba[j++] = (c[1] << 4 | c[2] >>> 2) & 0xff;
     if (i>2) uba[j++] = (c[2] << 6 | c[3]) & 0xff;
     if (i<4) break;
   }
   if (uba.length % 2 != 0) uba.length--;
   for (j=0; j<uba.length; j+=2) {
     ch = (uba[j] | uba[j+1] << 8).toString(16);
     ch = "0000".substring(ch.length) + ch;
     ucs += unescape("%u"+ch);
   }
   return ucs;
}
function base64Encode(str)
{
   var i, j, k;
   var b = [0,0,0];
   var uba = []; // unicode byte array
   var b64 = ""; // the base64 string
   var len; // length of base64 string
   var ch; // single character
   for (j=0,k=0; j<str.length; j++) {
     ch = str.charCodeAt(j);
     uba.length += 2;
     uba[k++] = ch & 0xff;
     uba[k++] = ch >>> 8;
   }
   for (j=k=len=0; ; ) {
     b[0] = b[1] = b[2] = 0;
     for (i=0; i<3 && j<uba.length; i++,j++)
     b[i] = uba[j];
     if (i==0) break;
     b64 += b64ch.charAt([b[0] >>> 2]);
     b64 += b64ch.charAt((b[0] & 0x03) << 4 | b[1] >>> 4);
     b64 += i>1 ? b64ch.charAt((b[1] & 0x0f) << 2 | b[2] >>> 6) : "=";
     b64 += i>2 ? b64ch.charAt(b[2] & 0x3f) : "=";
     len += 4;
     //if (flag && len%76==0) b64 += "\r\n";
   }
   return b64;
}