<html>
<style>.c {margin :1px;width:19px;height:19px;background:red;position:absolute;}
.d {margin :1px;width:19px;height:19px;background:gray;position:absolute;}
.f {top:0px;left:0px;background:black;position:absolute;}
</style>
<body></body><html>
<script>
var over=false,shapes=("0,1,1,1,2,1,3,1;1,0,1,1,1,2,2,2;2,0,2,1,2,2,1,2;0,1,1,1,1,2,2,2;1,2,2,2,2,1,3,1;1,1,2,1,1,2,2,2;0,2,1,2,1,1,2,2").split(";");
function create(tag,css){
var elm=document.createElement(tag);
elm.className = css;
document.body.appendChild(elm);
return elm;}
function Tetris(c, t, x, y){
var c=c?c:"c";
this.divs = [create("div",c),create("div",c),create("div",c),create("div",c)];
this.reset = function(){
this.x = typeof x != 'undefined'?x:3;
this.y = typeof y != 'undefined'?y:0;
this.shape = t?t:shapes[Math.floor(Math.random()*(shapes.length-0.00001))].split(",");
this.show();
if(this.field&&this.field.check(this.shape,this.x,this.y,'v')=='D'){
over=true;
this.field.fixShape(this.shape,this.x,this.y);
alert('game over');}}
this.show = function(){
for(var i in this.divs){
this.divs[i].style.left = (this.shape[i*2]*1+this.x)*20+'px';
this.divs[i].style.top = (this.shape[i*2+1]*1+this.y)*20+'px';}}
this.field=null;