var elements = ['text_01', 'text_02', 'text_03', 'text_04', 'text_05', 'text_06', 'text_07', 'text_08', 'text_09', 'text_10', 'text_11', 'text_12', 'text_13', 'text_14', 'text_15', 'text_16', 'text_17', 'text_18', 'text_19', 'text_20', 'text_21', 'text_22', 'text_23', 'text_24', 'text_25', 'text_26', 'text_27', 'text_28'];

var currentElement = '';

function showYesNo(idElement) {
	
	hideAll();
	var ele = document.getElementById(idElement);	
	
	if (navigator.appName == "Microsoft Internet Explorer") { 
		var displayType = 'block'; 	
	} else { 	
		var displayType = 'table-row'; 	
	}
		
	if(ele.style.display != displayType && currentElement != idElement) {
		ele.style.display = displayType;
		currentElement = idElement;
		
	} else {
		ele.style.display = 'none';
		currentElement = '';
		
		if (navigator.appName == 'Netscape') 
			history.go(0);
		
	}	
	
}

function hideAll() {	
	for(i=0;i<elements.length;i++) {
		document.getElementById(elements[i]).style.display = 'none';		
	}
}