function link1over() {
	document.getElementById('link_1').src='images/home-over.png';
}

function link1out() {
	document.getElementById('link_1').src='images/home.png';
}

function link2over() {
	document.getElementById('link_2').src='images/services-over.png';
}

function link2out() {
	document.getElementById('link_2').src='images/services.png';
}

function link3over() {
	document.getElementById('link_3').src='images/about-over.png';
}

function link3out() {
	document.getElementById('link_3').src='images/about.png';
}

function link4over() {
	document.getElementById('link_4').src='images/smileGallery-over.png';
	document.getElementById('link_4sub').style.display='block';
}

function link4out() {
	document.getElementById('link_4').src='images/smileGallery.png';
	document.getElementById('link_4sub').style.display='none';
}

function link5over() {
	document.getElementById('link_5').src='images/highTech-over.png';
}

function link5out() {
	document.getElementById('link_5').src='images/highTech.png';
}

function link6over() {
	document.getElementById('link_6').src='images/contact-over.png';
}

function link6out() {
	document.getElementById('link_6').src='images/contact.png';
}

function link7over() {
	document.getElementById('link_7').src='images/payment-over.png';
}

function link7out() {
	document.getElementById('link_7').src='images/payment.png';
}