jQuery.event.add(document, "ready", resizeFrame);
jQuery.event.add(window, "load", resizeFrame);
jQuery.event.add(window, "resize", resizeFrame);

function resizeFrame() 
{

    var h = $(window).height();
	if($("#main").height()<(h-675))
	{
    	$("#main").css('height',h-675);
	}
}