function setPostcard(obj, val) {
	var imgSrc = obj.getHref();
	document.getElementById('postcard_preview').getFirstChild().setSrc(imgSrc);
	document.getElementById('selected_postcard').setValue(val);
}

for (var i = 0; i < 9; i++) {
	if (document.getElementById('postcard' + i) !== undefined) {
		document.getElementById('postcard' + i).getFirstChild().addEventListener('click', function(){ setPostcard(this, i); return false; });
	}
}
//document.getElementById('postcard1').getFirstChild().addEventListener('click', function(){ setPostcard(this, 1); return false; });
//document.getElementById('postcard2').getFirstChild().addEventListener('click', function(){ setPostcard(this, 2); return false; });
//document.getElementById('postcard3').getFirstChild().addEventListener('click', function(){ setPostcard(this, 3); return false; });
//document.getElementById('postcard4').getFirstChild().addEventListener('click', function(){ setPostcard(this, 4); return false; });
//document.getElementById('postcard5').getFirstChild().addEventListener('click', function(){ setPostcard(this, 5); return false; });
//document.getElementById('postcard6').getFirstChild().addEventListener('click', function(){ setPostcard(this, 6); return false; });
//document.getElementById('postcard7').getFirstChild().addEventListener('click', function(){ setPostcard(this, 7); return false; });
//document.getElementById('postcard8').getFirstChild().addEventListener('click', function(){ setPostcard(this, 8); return false; });
//document.getElementById('postcard9').getFirstChild().addEventListener('click', function(){ setPostcard(this, 9); return false; });