this.tooltip = function(){	
	/* CONFIG */		
		xOffset = 10;
		yOffset = 20;		
		// these 2 variable determine popup's distance from the cursor
		// you might want to adjust to get the right result		
	/* END CONFIG */		
	$("area.tooltip").mouseover(function(e){											  
		this.t = this.id;
		var details = this.t.split("-");
		var county = details[0].replace("_"," ");
		var tag = details[1].replace("_"," ");
		var count = number_format(details[2].replace("_"," "),0);
		//alert(county);
		
		this.title = '';
		$("body").append("<div id='tooltip'><div id='overlay_county'>"+ county +"</div><span id='overlay_tag'>"+ tag +"</span><span id='overlay_count'>"+ count +" Properties</span></div>");
		$("#tooltip")
			.css("top",(e.pageY - xOffset) + "px")
			.css("left",(e.pageX + yOffset) + "px")
			.fadeIn("fast");		
    },
	function(){
		this.title = this.t;
		$("#tooltip").remove();
    });	
	$("area.tooltip").mousemove(function(e){
		$("#tooltip")
			.css("top",(e.pageY - xOffset) + "px")
			.css("left",(e.pageX + yOffset) + "px");
	});		
	$("area.tooltip").mouseout(function(e){
		$("#tooltip").remove();
	});			
};

// starting the script on page load
$(document).ready(function(){
	tooltip();
});

// {{{ number_format
// As seen on http://kevin.vanzonneveld.net/code/php_equivalents/php.js
function number_format( number, decimals, dec_point, thousands_sep ) {
    // Format a number with grouped thousands
    // 
    // +    discuss at: http://kevin.vanzonneveld.net/techblog/article/javascript_equivalent_for_phps_number_format/
    // +       version: 806.816
    // +   original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +     bugfix by: Michael White (http://crestidg.com)
    // +     bugfix by: Benjamin Lupton
    // +     bugfix by: Allan Jensen (http://www.winternet.no)
    // +    revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
    // +     bugfix by: Howard Yeend
    // *     example 1: number_format(1234.5678, 2, '.', '');
    // *     returns 1: 1234.57     

    var n = number, c = isNaN(decimals = Math.abs(decimals)) ? 2 : decimals;
    var d = dec_point == undefined ? "." : dec_point;
    var t = thousands_sep == undefined ? "," : thousands_sep, s = n < 0 ? "-" : "";
    var i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", j = (j = i.length) > 3 ? j % 3 : 0;
    
    return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
}// }}}