Probleme en javascript !!!

Bonjour,

ce code sa marche pas aider moi stp...

function m(){
var sinn = document.getElementById('si').innerHTML;

var hi = document.getElementById('co').height;

document.getElementById('co').height = hi - 10;

if(document.getElementById('co').height < 50){

clearInterval(h);

}else{

h = setInterval(m(),1000000);

}

}