function setupFrames(){
	
	if(document.getElementById('content_main').offsetHeight){
    	content_height=document.getElementById('content_main').offsetHeight;
		nav_height=document.getElementById('nav_main').offsetHeight;
    }
	
    else if(document.getElementById('content_main').style.pixelHeight){
    	content_height=document.getElementById('content_main').style.pixelHeight;
		nav_height=document.getElementById('nav_main').style.pixelHeight;
	}
	
	if(content_height < nav_height){
		document.getElementById('content_main').style.height = nav_height + "px";
	}
	
	else if(nav_height < content_height){
		document.getElementById('nav_main').style.height = content_height + "px";
	}
}