function setColumnHeight() {
	oo = document.getElementById('main_col');
	hh = oo.offsetHeight;
	if (parseInt(hh) < 500) {
		oo.style.height = '500px';
	}
	hh = oo.offsetHeight;
	document.getElementById('left_col').style.height = hh + 'px';
	document.getElementById('right_col').style.height = hh + 'px';
}

preload_image_object = new Image();
arr_imgs = ['imgs/bg_home_on.gif','imgs/bg_pressroom_on.gif','imgs/bg_managementteam_on.gif','imgs/bg_presskit_on.gif','imgs/bg_privacypolicy_on.gif','imgs/bg_termsofuse_on.gif','imgs/bg_contactus_on.gif','imgs/cr_aboutus_on.gif','imgs/cr_artists_on.gif','imgs/cr_photographers_on.gif','imgs/cr_termsofuse_on.gif','imgs/cr_privacypolicy_on.gif']
for(i=0; i < arr_imgs.length; i++) {
	preload_image_object.src = arr_imgs[i];
}
setColumnHeight();
window.onresize = setColumnHeight;