/**
  * @author Mike Collins
  * Switch between product tabs
  */

function switchProductsTab(id) {
	
	//reset all tabs to unselected
	for (i = 1; i <= 4; i++) {
		//only perform operation if tab exists
		if (document.getElementById('product-tab' + i + '-selected')) {
			document.getElementById('product-tab' + i + '-selected').style.display = 'none';	
			document.getElementById('product-tab-description' + i).style.display = 'none';	
			document.getElementById('product-tab' + i + '-unselected').style.display = 'inline';	
		}
	}
	
	//select a tab	
	document.getElementById('product-tab' + id + '-unselected').style.display = 'none';
	document.getElementById('product-tab' + id + '-selected').style.display = 'inline';
	document.getElementById('product-tab-description' + id).style.display = 'inline';	
}


/**
  * @author Mike Collins
  * Switch between product images
  */


function switchProductImages(id) {
	
	//hide all product images
	for (i = 0; i <= 9; i++) {
		//only perform operation if tab exists
		if (document.getElementById('productimage' + i)) {
			document.getElementById('productimage' + i).style.display = 'none';	
		}
	}	
	
	document.getElementById('productimage' + id).style.display = '';		
}

/**
  * @author Mike Collins
  * Check submission of the question form
  */

function checkQuestionForm() {
	error = false;
	msg = "You must complete all fields";
	if (document.getElementById('name').value == '') error = true;
	if (document.getElementById('email').value == '') error = true;
	if (document.getElementById('enquiry').value == '') error = true;
		
	if (error) {
		alert(msg);
		return false;
	} else {
		return true;
	}
}