function switch_tabs(destination) {
	div_name = ('home');
	document.getElementById(div_name).style.backgroundPosition='bottom';
	div_name = ('about');
	document.getElementById(div_name).style.backgroundPosition='bottom';
	div_name = ('products');
	document.getElementById(div_name).style.backgroundPosition='bottom';
	div_name = ('shopping_cart');
	document.getElementById(div_name).style.backgroundPosition='bottom';
	div_name = ('contact');
	document.getElementById(div_name).style.backgroundPosition='bottom';

	div_name = (destination);
	document.getElementById(div_name).style.backgroundPosition='top';
	

}