var renderFunctions = [];
var mseconds = 50;
var interval = setInterval("render()",mseconds);
function render(){
	for(var f in renderFunctions){
		this[renderFunctions[f]]();
	}
}
function addRenderFunction(name){
	renderFunctions.push(name);
}
function removeRenderFunction(name){
	var newList = [];
	for(var f in renderFunctions){
		f = renderFunctions[f];
		if(f != name){
			newList.push(f);
		}
	}
	renderFunctions = newList;
}