function HideAll(){
	for(var i=1; i<5; i++){
		var div = $("modal_block_" + i);
		if(div)div.setStyle('display', 'none');
	}	
}

window.addEvent('domready',function(){
	for(var i=1; i<5; i++){
		var a = $("modal_btn_" + i);
		if(a)a.addEvent('click', function(e){HideAll();this.setStyle('display', '');e.stop();}.bind($("modal_block_" + i)));
		var a = $("modal_close_" + i);
		if(a)a.addEvent('click', function(){HideAll();});
	}
	$(document.body).addEvent('click', function(){HideAll()});
});