function checkform(){
}

function displayElement(element){
	var elementToDisplay = document.getElementById(element);
	elementToDisplay.className = 'visible;'
}

function hideElement(element){
	var elementToHide = document.getElementById(element);
	elementToHide.className = 'invisible';
}

function checkProduct(element){
	var productField = document.getElementById(element);
	var product = productField.value;	
	if (product == 'avchat3'){
			displayElement('avchat3_components');
	}
}

function changeProduct(product){
	
	if (product != 'avchat3'){
		hideElement('avchat3_components');
	}else 
	if(product == 'avchat3'){
		displayElement('avchat3_components');
	}
	
}