$(document).ready(function(){
	$(".subscribe_btn").click(function(e){
		e.preventDefault();	
		
		var id = $(this).attr("id");
		var subscr_type = id.substr(0, id.indexOf("_"));
		window.open("/subscribe.php?type="+subscr_type,"subscribe_window","width=250, height=180");	
		});
	});