Merging the Limesurvey 1.91+ branch of queXS in to the trunk

include/limesurvey/scripts/jquery/jquery.checkgroup.js

@@ -0,0 +1,46 @@
+(function($){
+	$.fn.checkgroup = function(options){
+		//merge settings
+		settings=$.extend({
+			groupSelector:null,
+			groupName:'group_name',
+			enabledOnly:false
+		},options || {});
+		
+		var ctrl_box=this;
+
+		
+		//allow a group selector override option
+		var grp_slctr = (settings.groupSelector==null) ? 'input[name='+settings.groupName+']' : settings.groupSelector;
+		
+		//grab only enabled checkboxes if required
+		if(settings.enabledOnly)
+		{
+			grp_slctr += ':enabled';
+		}
+
+		//attach click event to the "check all" checkbox(s)
+		ctrl_box.click(function(e){
+			chk_val=(e.target.checked);
+			$(grp_slctr).attr('checked',chk_val);
+			//if there are other "select all" boxes, sync them
+			ctrl_box.attr('checked',chk_val);
+		});
+		//attach click event to checkboxes in the "group"
+		$(grp_slctr).click(function(){
+			if(!this.checked)
+			{
+				ctrl_box.attr('checked',false);
+			}
+			else
+			{
+				//if # of chkbxes is equal to # of chkbxes that are checked
+				if($(grp_slctr).size()==$(grp_slctr+':checked').size()){
+					ctrl_box.attr('checked','checked');
+				}
+			}
+		});
+		//make this function chainable within jquery
+		return this;
+	};						
+})(jQuery);