function nav_rollover(side){
	if(side == "left"){
	document.getElementById(side).innerHTML = "<a href=\"javascript://\" onmouseover=\"nav_rollover('left');\" onmouseout=\"nav_rollout('left');\" ><img src=\"images/header_nav_main_left.gif\" border=\"0\" /></a>";
	}
	else{
	document.getElementById(side).innerHTML = "<img src=\"images/header_nav_main_right_over.gif\" border=\"0\"/>";
	}
}

function nav_rollout(side){
	if(side == "left"){
	document.getElementById(side).innerHTML = "<a href=\"javascript://\" onmouseover=\"nav_rollover('left');\" onmouseout=\"nav_rollout('left');\" ><img src=\"images/header_nav_main_left_over.gif\" border=\"0\" /></a>";
	}
	else{
	document.getElementById(side).innerHTML = "<img src=\"images/header_nav_main_right.gif\" border=\"0\"/>";
	}
}