Nifty Corners Cube - freedom to round

Nifty Corners Cube - freedom to round
http://www.html.it/articoli/niftycube/niftycube.js
http://www.html.it/articoli/niftycube/niftyCorners.css
nifty cube layout with same height
Mix two colors:

function rgb2hex(value){
    var hex="",v,h,i;
    var regexp=/([0-9]+)[, ]+([0-9]+)[, ]+([0-9]+)/;
    var h=regexp.exec(value);
    for(i=1;i<4;i++){
        v=parseInt(h[i]).toString(16);
        if(v.length==1) hex+="0"+v;
        else hex+=v;
    }
    return("#"+hex);
}
function Mix(c1,c2){
    var i,step1,step2,x,y,r=new Array(3);
    if(c1.length==4)step1=1;
    else step1=2;
    if(c2.length==4) step2=1;
    else step2=2;
    for(i=0;i<3;i++){
        x=parseInt(c1.substr(1+step1*i,step1),16);
        if(step1==1) x=16*x+x;
        y=parseInt(c2.substr(1+step2*i,step2),16);
        if(step2==1) y=16*y+y;
        r[i]=Math.floor((x*50+y*50)/100);
        r[i]=r[i].toString(16);
        if(r[i].length==1) r[i]="0"+r[i];
    }
    return("#"+r[0]+r[1]+r[2]);
}
// console.log(Mix('#333333', '#ffffff'));
// output: #999999

niftycorner, nifty corner, niftycube, nifty cube