// Global Javascripts for the Physics Website
// Requires JQuery

// show the print stylesheet if '&print' is in the location
gy = window.location.search.substring(1).split("&");
ft = gy[0].split("=");
if (ft[0]=='print') {
	document.write('<link rel="stylesheet" type="text/css" href="/css/print.css">');
}

function printVersion() {
	window.open(location.href+"?print");
}

// code attrib: http://derekallard.com/blog/post/conditionally-sticky-sidebar/ 
function physics_activateBackToTopLink(div_id)
{
	window.onscroll = function()
	{
		child_match = div_id + ' > div';
		if( window.XMLHttpRequest ) { // Exclude use IE 6
			if (document.documentElement.scrollTop > 500 || self.pageYOffset > 500) {
				$(child_match).css('position', 'fixed');
				$(child_match).css('top', '0');
				$(child_match).css('float', 'right');
				$(div_id).css('display','block');
				
			} else if (document.documentElement.scrollTop < 500 || self.pageYOffset < 500) {
				$(child_match).css('position', 'absolute');
				$(child_match).css('top', '500px');
				$(div_id).css('display','none');
			}
		}
	}
	
}