function position_corners() {
	var divs = document.getElementsByTagName('div');
	for (i=0;i<divs.length;i++) {
		if (divs[i].className=='corner_lt'
			|| divs[i].className=='corner_rt' 
			|| divs[i].className=='corner_rb' 
			|| divs[i].className=='corner_lb' 
		) {
			divs[i].parentNode.style.position = 'relative';
			divs[i].style.display = 'block'; //display is 'none' in the CSS, so no weird things show up when this script fails
		}
	}				
}

if (window.addEventListener) {
	window.addEventListener("load",position_corners,false);
} else if (document.addEventListener) {	
	document.addEventListener("load",position_corners,false);
} else if (window.attachEvent) {
	window.attachEvent("onload", position_corners);
}