function blink( id, delay ) {
	this.obj = "blinkObj" + blink.count++;
	eval( this.obj + " = this " );
	this.css = ( document.getElementById? document.getElementById( id ).style : (document.all? document.all.fooImg.style : document.layers.fooImg ) );
	if( !this.css && !document.layers ) alert( 'Errore: non trovo il DIV con id="' + id + '"' );
	this.delay = delay || 1000;
	this.blinking = false;
	
	this.setDelay = function( delay ) { this.delay = delay; }
	
	this.isBlinking = function() { return this.blinking; }

	this.start = function() { if( this.isBlinking() ) return false; else this.go(); return true; }
	
	this.go = function() {
		this.blinking = true;
		if( this.isVisible() ) this.hide();
		else this.show();
		this.timer = setTimeout( this.obj + ".go()", this.delay );
	}
	
	this.isVisible = function() { return ( this.css.visibility == "visible" || this.css.visibility == "show" ); }
	
	this.hide = function() { this.css.visibility = ( document.layers? "hide" : "hidden" );  }
	
	this.show = function() { this.css.visibility = ( document.layers? "show" : "visible" ); }

	this.stop = function() {
		this.show();
		this.blinking = false;
		clearTimeout( this.timer );
	}
	return this;
}
blink.count = 0;