var preloadFlag = false;

function preloadImages() {
	if (document.images) {
		pre_link_1_a = newImage('img/link_1_a.gif');
		pre_link_1 = newImage('img/link_1.gif');
		pre_link_2_a = newImage('img/link_2_a.gif');
		pre_link_3_a = newImage('img/link_3_a.gif');
		pre_link_4_a = newImage('img/link_4_a.gif');
		pre_link_5_a = newImage('img/link_5_a.gif');
		pre_link_6_a = newImage('img/link_6_a.gif');
		pre_link_7_a = newImage('img/link_7_a.gif');
		preloadFlag = true;
	}
}