// ******************* [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 x=0; x<16; x++) {

	 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 *********** //