//method1 slow !!

		            //*

		            for(var ds in dataset[key].data){

			            commit_data = dataset[key].data[ds];

			            if (commit_data.time >= ranges.xaxis.from && commit_data.time <= ranges.xaxis.to){

			            	push = true;

			            	break;

					    }

				    }

					//*/

				    /*//method2 sorted commit data !!!

				    var first_commit = dataset[key].data[0].time;

				    var last_commit = dataset[key].data[dataset[key].data.length-1].time;

				    if (first_commit >= ranges.xaxis.from && last_commit <= ranges.xaxis.to){

						push = true;

					}

				    //*/

				    if(push){			

				    	data.push(dataset[key]);

				    }

				}

				if(data.length >= 1){

					return data;

				} 

				else{

					//just return dummy data for graph to plot itself

					return [getDummyData('')];	

				}

		    }

			/**

			* redraw using new checkbox data

			*/

		    function plotchoiced(e,args){

			    var cur_data = args[0];

			    var cur_ranges = args[1];

				var new_data = [];

		    	var inputs = choiceContainer.getElementsByTagName("input");

		    	//show only checked labels

		        for(var i=0; i<inputs.length; i++) {

		            var checkbox_key = inputs[i].name;

	                if(inputs[i].checked){

						for(var d in cur_data){

							if(cur_data[d].label == checkbox_key){

								new_data.push(cur_data[d]);

							}

						}			                

	    	        }

	                else{

		                //push dummy data to not hide the label

						new_data.push(getDummyData(checkbox_key));

			        }

		        }

		    	var new_options = YAHOO.lang.merge(plot_options, {

		            xaxis: { 

		  	      		min: cur_ranges.xaxis.from, 

		  	      		max: cur_ranges.xaxis.to,

		  	      		mode:"time",

		  	      		timeformat: "%d/%m",

		        	},

		    	});

		    	if (!new_data){

					new_data = [[0,1]];

				}

		    	// do the zooming

		       plot = YAHOO.widget.Flot(plotContainer, new_data, new_options);

		       plot.subscribe("plotselected", plotselected);

		       //resubscribe plothover

		       plot.subscribe("plothover", plothover);

		       // don't fire event on the overview to prevent eternal loop

		       overview.setSelection(cur_ranges, true);

		    }

			/**

		     * plot only selected items from overview

		     * @param ranges

		     * @returns

		     */

		    function plotselected(ranges,cur_data) {

			    //updates the data for new plot

	    		data = getDataAccordingToRanges(ranges);

	    		generateCheckboxes(data);

		    	var new_options = YAHOO.lang.merge(plot_options, {

		            xaxis: { 

		  	      		min: ranges.xaxis.from, 

		  	      		max: ranges.xaxis.to,

		  	      		mode:"time",

		  	      		timeformat: "%d/%m",

		        	},

		        	yaxis: { 

                        min: ranges.yaxis.from, 

                        max: ranges.yaxis.to,

                    },

		    	});

		    	// do the zooming

		        plot = YAHOO.widget.Flot(plotContainer, data, new_options);

		        plot.subscribe("plotselected", plotselected);

		        //resubscribe plothover

		        plot.subscribe("plothover", plothover);

		        // don't fire event on the overview to prevent eternal loop

		        overview.setSelection(ranges, true);

		        //resubscribe choiced

		        YAHOO.util.Event.on(choiceContainer.getElementsByTagName("input"), "click", plotchoiced, [data, ranges]);

		    }

		    var previousPoint = null;

			function plothover(o) {

		        var pos = o.pos;

		        var item = o.item;

		        //YAHOO.util.Dom.get("x").innerHTML = pos.x.toFixed(2);

		        //YAHOO.util.Dom.get("y").innerHTML = pos.y.toFixed(2);

		        if (item) {

		            if (previousPoint != item.datapoint) {

		                previousPoint = item.datapoint;

		                var tooltip = YAHOO.util.Dom.get("tooltip");

		                if(tooltip) {

		                	  tooltip.parentNode.removeChild(tooltip);

		                }

		                var x = item.datapoint.x.toFixed(2);

		                var y = item.datapoint.y.toFixed(2);

		                if (!item.series.label){

		                    item.series.label = 'commits';

		                }

		                var d = new Date(x*1000);

		                var fd = d.toDateString()

		                var nr_commits = parseInt(y);

		                var cur_data = dataset[item.series.label].data[item.dataIndex];

		                var added = cur_data.added;

		                var changed = cur_data.changed;

		                var removed = cur_data.removed;

		                var nr_commits_suffix = " ${_('commits')} ";

		                var added_suffix = " ${_('files added')} ";

		                var changed_suffix = " ${_('files changed')} ";

		                var removed_suffix = " ${_('files removed')} ";

		                if(nr_commits == 1){nr_commits_suffix = " ${_('commit')} ";}

						if(added==1){added_suffix=" ${_('file added')} ";}

						if(changed==1){changed_suffix=" ${_('file changed')} ";}

						if(removed==1){removed_suffix=" ${_('file removed')} ";}

		                showTooltip(item.pageX, item.pageY, item.series.label + " on " + fd

								 +'<br/>'+

		                         nr_commits + nr_commits_suffix+'<br/>'+

		                         added + added_suffix +'<br/>'+

		                         changed + changed_suffix + '<br/>'+

		                         removed + removed_suffix + '<br/>');

		            }

		        }

		        else {

		        	  var tooltip = YAHOO.util.Dom.get("tooltip");

			          if(tooltip) {

			                tooltip.parentNode.removeChild(tooltip);

			          }

		            previousPoint = null;

		        }

		    }

		    /**

		     * MAIN EXECUTION

		     */

			var data = getDataAccordingToRanges(initial_ranges);

			generateCheckboxes(data);

		    //main plot