function showMenu (tab,menu,submenu) {
  jQuery('.currenttab').removeClass("currenttab");
  jQuery('.currentmenu').removeClass("currentmenu");
  
  jQuery('#tab'+tab).addClass("currenttab");
  
  if(menu==null) return;
  
  jQuery('#menu'+menu).addClass("currentmenu");
  
  if(submenu==null) return;
}

function externalLinks() {
	 if (!document.getElementsByTagName) return;
	 var anchors = document.getElementsByTagName("a");
	 for (var i=0; i<anchors.length; i++) {
		   var anchor = anchors[i];
		   if (anchor.getAttribute("href") &&
				   anchor.getAttribute("rel") == "external")
			 anchor.target = "_blank";
	 }
}
window.onload = externalLinks;

function getNbDays(year, month) {
	month = parseInt(month);
	switch(month) {
		case 1:	case 3:	case 5:	case 7:
		case 8:	case 10: case 12: 
			return 31;
			break;
		case 4: case 6: 
		case 9:	case 11:
			return 30;
			break;
		case 2:
			if(isLeapYear(year)) return 29;
			else return 28;
			break;
	}
}

function isLeapYear(datea) {
	datea = parseInt(datea);
	if(datea%4 == 0) {
		if(datea%100 != 0) return true;
		else {
			if(datea%400 == 0) return true;
			else return false;
		}
	}
	return false;
}