<SCRIPT language="JavaScript">
var browser = "unknown";
var version = 0;
if (navigator.userAgent.indexOf("Opera") >= 0)
browser = "opera";
else if (navigator.userAgent.indexOf("obot") >= 0)
browser = "robot";
else if (navigator.appName.indexOf("etscape") >= 0)
browser = "netscape";
else if (navigator.appName.indexOf("icrosoft") >= 0)
browser = "msie";
version = parseFloat(navigator.appVersion);
if (isNaN(version)) version = 0;
if ((browser == "msie")&&(version == 2)) version = 3;
// lookup table
var tohex = new Array(256);
var hex = "0123456789ABCDEF";
var count = 0;
for (x=0; x<16; x++) {
for (y=0; y<16; y++) {
tohex[count] = hex.charAt(x) + hex.charAt(y);
count++;
}
}
//ColorCode constructor
function ColorCode(hexcode) {
if (hexcode.length == 7) {
this.r = parseInt(hexcode.substring(1,3),16);
this.g = parseInt(hexcode.substring(3,5),16);
this.b = parseInt(hexcode.substring(5,7),16);
}
else if (hexcode.length == 6) {
this.r = parseInt(hexcode.substring(0,2),16);
this.g = parseInt(hexcode.substring(2,4),16);
this.b = parseInt(hexcode.substring(4,6),16);
}
else {
this.r = this.g = this.b = 0;
alert("Error: ColorCode constructor failed");
}
if (isNaN(this.r)||isNaN(this.g)||isNaN(this.b))
alert("Error: ColorCode constructor failed");
}
// ColorList constructor
function ColorList(hexcodes) {
var i = 0;
var c = 0;
this.codes = new Array(Math.round(hexcodes.length/7));
while (i < hexcodes.length) {
if (isNaN(parseInt(hexcodes.substring(i,i+6),16))) ++i;
else {
this.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
}
// x=index of letter, y=number of letters, z=number of colors
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 gradient (thetext,thecolors) {
if (((browser == "netscape")||(browser == "msie")||(browser == "opera"))&&(version>=3.0)) {
var colors = new ColorList(thecolors);
var numcolors = colors.len;
var numchars = thetext.length;
var rr = 0;
var gg = 0;
var bb = 0;
var lci = 0; //lower color index
var hci = 0; //high color index
for (i=0; i<numchars; ++i) {
lci = lowcolorindex(i, numchars, numcolors);
hci = hicolorindex(i, numchars, numcolors, lci);
rr = Math.round(interpolate( lci/(numcolors-1), colors.codes[lci].r, hci/(numcolors-1), colors.codes[hci].r, i/(numchars-1)));
gg = Math.round(interpolate( lci/(numcolors-1), colors.codes[lci].g, hci/(numcolors-1), colors.codes[hci].g, i/(numchars-1)));
bb = Math.round(interpolate( lci/(numcolors-1), colors.codes[lci].b, hci/(numcolors-1), colors.codes[hci].b, i/(numchars-1)));
if (browser == "opera") {
rr = 255 - rr;
gg = 255 - gg;
bb = 255 - bb;
}
document.write(thetext.charAt(i).fontcolor(tohex[rr]+tohex[gg]+tohex[bb]));
}
}
else document.write(thetext); // unrecognized browser, better not to attempt anything fancy
}
</SCRIPT>
<SCRIPT language="JavaScript">
gradient("always wanted to be a genius?","FF0000 FFFFFF 0000FF");
document.write('<BR>');
gradient("...well...do it, in...","444444 DDDDDD 444444");
document.write('<BR><FONT size=+1><TT><B>');
gradient("snazzy, eyecatching, gradient colors!","FF8888 FFFF88 88FF88 88FFFF 8888FF FF88FF");
document.write('</B></TT></FONT><BR><FONT size=2>');
gradient("but uhm, just be careful not to overdo it","884488 444488 448888 448844 888844 884444");
document.write("</FONT><BR>");
</SCRIPT>
