function showBoxIf(obj, box, value_if, tofocus)
{
	if (!obj.value) { 
		var obj = document.getElementById(obj);
	}
	var	box = document.getElementById(box);
	var tofocus = document.getElementById(tofocus);
	if (!box) {return false}
	if(obj.value === value_if) {

		box.className = 'visibleBox';
		if (tofocus) {
			tofocus.focus();
		}
	} else {
		box.className = 'hiddenBox';	
	}
	
	
}