HTML Color Picker(js拾色器效果)

<form name="recherche" method="post" action="yourpage.html">
<input type=hidden name="rgb" value="123">
<table style="background-color:#f6f6f6;border:1px dotted #666;padding:5px;margin:0px auto;">
<tr><td align=right>Couleur:<br><small>Cliquez pour lister les<br>oeuvres les plus proches<br>de la couleur sélectionnée</small></td>
<td style="border:1px outset #CCF;background-color:#ffe;width=172">
<div id=temoin style='float:right;width:40px;height:128px;'> </div>

<script language="Javascript" type="text/javascript">
<!--
var total=1657;var X=Y=j=RG=B=0;
var aR=new Array(total);var aG=new Array(total);var aB=new Array(total);
for (var i=0;i<256;i++){
aR[i+510]=aR[i+765]=aG[i+1020]=aG[i+5*255]=aB[i]=aB[i+255]=0;
aR[510-i]=aR[i+1020]=aG[i]=aG[1020-i]=aB[i+510]=aB[1530-i]=i;
aR[i]=aR[1530-i]=aG[i+255]=aG[i+510]=aB[i+765]=aB[i+1020]=255;
if(i<255){aR[i/2+1530]=127;aG[i/2+1530]=127;aB[i/2+1530]=127;}
}
function p(){var jla=document.getElementById('choix');jla.innerHTML=artabus;jla.style.backgroundColor=artabus;document.forms['recherche'].rgb.value=artabus}
var hexbase=new Array("0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F");
var i=0;var jl=new Array();
for(x=0;x<16;x++)for(y=0;y<16;y++)jl[i++]=hexbase[x]+hexbase[y];
document.write('<'+'table border="0" cellspacing="0" cellpadding="0" onMouseover="t(event)" onClick="p()">');
var H=W=63;
for (Y=0;Y<=H;Y++){
 s='<'+'tr height=2>';j=Math.round(Y*(510/(H+1))-255)
 for (X=0;X<=W;X++){
  i=Math.round(X*(total/W))
  R=aR[i]-j;if(R<0)R=0;if(R>255||isNaN(R))R=255
  G=aG[i]-j;if(G<0)G=0;if(G>255||isNaN(G))G=255
  B=aB[i]-j;if(B<0)B=0;if(B>255||isNaN(B))B=255
  s=s+'<'+'td width=2 bgcolor=#'+jl[R]+jl[G]+jl[B]+'><'+'/td>'
 }
 document.write(s+'<'+'/tr>')
}
document.write('<'+'/table>');
var ns6=document.getElementById&&!document.all
var ie=document.all
var artabus=''
function t(e){
source=ie?event.srcElement:e.target
if(source.tagName=="TABLE")return
while(source.tagName!="TD" && source.tagName!="HTML")source=ns6?source.parentNode:source.parentElement
document.getElementById('temoin').style.backgroundColor=artabus=source.bgColor
}
// -->
</script>
<div id=choix style='height:24px;'  onClick="document.forms['recherche'].rgb.value='';this.style.backgroundColor=''"> </div><td></tr>
<tr><td colspan=2 align=center><input type=submit></td></tr>
</table>
</form>