// ******************* [gradient] code ******************* //
// 1001 Astuces Nam@ni , la Source JavaScript!!
// http://www.namani.net
function gradient_gradient_browser() {
	gradient_browser = "unknown";
	gradient_version = 0;
	if (navigator.userAgent.indexOf("Opera") >= 0)
	 gradient_browser = "opera";
	else if (navigator.userAgent.indexOf("obot") >= 0)
	 gradient_browser = "robot";
	else if (navigator.appName.indexOf("etscape") >= 0)
	 gradient_browser = "netscape";
	else if (navigator.appName.indexOf("icrosoft") >= 0)
	 gradient_browser = "msie";
	gradient_version = parseFloat(navigator.appVersion);
	if (isNaN(gradient_version)) gradient_version = 0;
	if ((gradient_browser == "msie")&&(gradient_version == 2)) gradient_version = 3;
	gradient_tohex = new Array(256);
	var hex = "0123456789ABCDEF";
	var count = 0;
	 for (var y=0; y<16; y++) {
		gradient_tohex[count] = hex.charAt(x) + hex.charAt(y);
		count++;
	 }
	}
}

function ColorCode(hexcode) {
  if (hexcode.length == 7) {
    this.gradient_r = parseInt(hexcode.substring(1,3),16);
    this.gradient_g = parseInt(hexcode.substring(3,5),16);
    this.gradient_b = parseInt(hexcode.substring(5,7),16);
  }
  else if (hexcode.length == 6) {
    this.gradient_r = parseInt(hexcode.substring(0,2),16);
    this.gradient_g = parseInt(hexcode.substring(2,4),16);
    this.gradient_b = parseInt(hexcode.substring(4,6),16);
  }
  else {
    this.gradient_r = this.gradient_g = this.gradient_b = 0;    
  }  
}

function ColorList(hexcodes) {
  var i = 0;
  var c = 0;
  this.gradient_codes = new Array(Math.round(hexcodes.length/7));
  while (i < hexcodes.length) {
    if (isNaN(parseInt(hexcodes.substring(i,i+6),16))) ++i;
    else {
      this.gradient_codes[c] = new ColorCode(hexcodes.substring(i,i+6));
      i += 7;
      ++c;
    }
  }
  this.len = c;
}

function interpolate (x1, y1, x3, y3, x2) {
  if (x3 == x1) return y1
  else return (x2-x1)*(y3-y1)/(x3-x1) + y1
}

function lowcolorindex (x, y, z) {
  if (y == 1) return 0
  else return Math.floor( (x*(z-1))/(y-1) )
}

function hicolorindex (x, y, z, low) { 
  if ( low*(y-1) == x*(z-1) ) return low
  else if (y == 1) return 0
  else return Math.floor( (x*(z-1))/(y-1) + 1 )
}

function drawGradient() {
	var found = 0;
	var d = document.getElementsByTagName("DIV");
	for (var i = d.length - 1; i >= 0; i--) {
		if (d[i].id == "mygradient") {
			d[i].id = "";
			div = d[i];
			found = 1;
			break;
		}
	}
	if (found == 0) return;	
	clr = div.tag
	clr = clr.replace(/\#/g, "");
	clr = clr.replace(/[ ]+/g, " ");
	clr += "      ";
	clr = clr.split(" ");
	gradient_gradient_browser();
	gradient_thecolors = "#" + clr[0].substr(0,6);
	gradient_thecolors += "#" + clr[1].substr(0,6);
	gradient_thecolors += "#" + clr[2].substr(0,6);
	gradient_thecolors += "#" + clr[3].substr(0,6);
	gradient_thecolors += "#" + clr[4].substr(0,6);	
	
	var gradient_html = "";
	if (((gradient_browser == "netscape")||(gradient_browser == "msie")||(gradient_browser == "opera"))&&(gradient_version>=3.0)) {
		
		var colors = new ColorList(gradient_thecolors);
		if (colors.len < 2) {
			div.style.display = "block";
			return;
		}		
		var numcolors = colors.len;		
		var numchars = div.innerText.replace(/[\n\r\t ]/g, "").length;
		var rr = 0;
		var gg = 0;
		var bb = 0;
		var lci = 0; //lower color index
		var hci = 0; //high color index
		var chr, p = 0;
		for (i = 0; p < numchars; ++i) {
			chr = div.innerText.charAt(i);
			if (" \r\n\t".indexOf(chr) != -1) {
				gradient_html += chr;
			} else {				
				lci = lowcolorindex(p, numchars, numcolors);
				hci = hicolorindex(p, numchars, numcolors, lci);
				rr = Math.round(interpolate( lci/(numcolors-1), colors.gradient_codes[lci].gradient_r, hci/(numcolors-1), colors.gradient_codes[hci].gradient_r, p/(numchars-1)));
				gg = Math.round(interpolate( lci/(numcolors-1), colors.gradient_codes[lci].gradient_g, hci/(numcolors-1), colors.gradient_codes[hci].gradient_g, p/(numchars-1)));
				bb = Math.round(interpolate( lci/(numcolors-1), colors.gradient_codes[lci].gradient_b, hci/(numcolors-1), colors.gradient_codes[hci].gradient_b, p/(numchars-1)));
				if (gradient_browser == "opera") {
					rr = 255 - rr;
					gg = 255 - gg;
					bb = 255 - bb;
				}				
				gradient_html += chr.fontcolor(gradient_tohex[rr]+gradient_tohex[gg]+gradient_tohex[bb]);
				p++;
			}
		}
	} else
		gradient_html += div.innerText;	
	div.innerHTML = gradient_html.replace(/\r/gi, "<br>");
	gradient_html = "";
	div.style.display = "block";
}
// *********** [/gradient] code *********** //