function changeimage(towhat, imageNo) {
	if(document.images) {
		eval('document.images.targetimage'+imageNo).src=towhat.src;
	}
}

//return if a selection has been made in a form according to a certain field
//useful for lists with radio button where an action can be taken on an object
function existsSelection(field) {
	if(field) {

		for(i = 0; i < field.length; i++) if(field[i].checked) return true;
		if(i == 0) return field.checked;

	}
	return false;
}

function popup(link, name, w, h, options) {

	var l = 0;
	var t = 0;
	var maximize = false;

	if(screen) {
		if(w && h) {

			l = (screen.width - w) / 2;
			t = (screen.height - h) / 2;

		}
		else {
			maximize = true;
		}
	}

	if(!options) {
		options = 'directories=1,location=1,menubar=1,status=1,titlebar=1,toolbar=1,resizable=1,scrollbars=1,';
	}
	
	var win = window.open(link,name,options + 'top='+t+',left='+l+',width='+w+',height='+h);
	win.focus();
	if(maximize) win.resizeTo(screen.width, screen.height - 25);

}

function resizeToFull() {
	self.moveTo(0,0);
	if(screen) {
		self.resizeTo(screen.width, screen.height);
	}
}

function getElement(id) {
	return document.getElementById ? document.getElementById(id) : document.all[id];
}

function toggleVisibility(id) {
	var field = getElement(id);
	var vty = field.style.visibility=='visible' ? 'hidden' : 'visible';
	field.style.visibility = vty;
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

// init contacts for messagerie
var contacts = '';
function gotoMessagerie() {
	if(!self.opener || self.opener.closed || !self.opener.addContacts) {
		self.opener = window.open('','messagerie','directories=0,location=0,top=0,left=0,menubar=0,status=0,titlebar=0,toolbar=0,resizable=1,scrollbars=0,height=530,width=495');
		document.formMessagerie.contacts.value = contacts;
		document.formMessagerie.submit();
	}
	else {
		self.opener.addContacts(contacts);
	}
}