function toggle() {
	this.showing = !this.showing;
	var abstracts = document.getElementsByTagName("div")
	for (var i=0; i < abstracts.length; i++) {
		var class = abstracts[i].getAttribute("class");
		if (class != "abstract") continue;
		abstracts[i].style.display = this.showing ? "block" : "none" ;
	}
	document.getElementById("link").innerHTML = this.showing? "Hide abstracts": "Show abstracts";
}
toggle.showing=false;

function popup(url) {
	window.open(url,"popup","width=500,height=300,resizable=yes,toolbar=no,scrollbars");	
}

/**
Here's how to get the popup inside the window:
$.get(url, "", function(data){
		$("<div style=\"position:absolute; width:500px; height:auto; top:100px; left:150px;background:white; border:1px solid #3366CC; padding:1em\"></div>").appendTo("#content").html(data);
	});
*/