function changeSelectActivite(){ 
	
	/*
    var xhr; 
    try {  xhr = new ActiveXObject('Msxml2.XMLHTTP');   }
    catch (e){
        try {   xhr = new ActiveXObject('Microsoft.XMLHTTP');    }
        catch (e2){
          try {  xhr = new XMLHttpRequest();     }
          catch (e3) {  xhr = false;   }
        }
    }
 
    xhr.onreadystatechange  = function(){ 
         if(xhr.readyState  == 4){
            if(xhr.status  == 200) 
            	document.forms['n'].spaw1.value="Received:"  + xhr.responseText; 
            else{
            	//document.forms['n'].spaw1.value="Error code ";
            	document.forms['n'].toto.value="Error code ";
            }
         }
    }; 

   xhr.open( "GET", "data.xml",  true); 
   xhr.send(null); 
   */
}
function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ) {	el.style.display = 'block';}
	else {el.style.display = 'none';}
}
function blanket_size(popUpDivVar) {
		
	if (typeof window.innerWidth != 'undefined') {
		viewportheight = window.innerHeight;
	} else {
		viewportheight = document.documentElement.clientHeight;
	}
	
	if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
		blanket_height = viewportheight;
	} else {
		blanket_height = document.body.parentNode.clientHeight;
		
		if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
			blanket_height = document.body.parentNode.clientHeight;
		} else {
			blanket_height = document.body.parentNode.scrollHeight;
		}
	}
	
	var blanket = document.getElementById('blanket');
	blanket.style.height = blanket_height + 'px';
	var popUpDiv = document.getElementById(popUpDivVar);
	popUpDiv_height=document.body.parentNode.clientHeight/2-150;//150 is half popup's height
	popUpDiv.style.top = popUpDiv_height + 'px';
}
function window_pos(popUpDivVar) {
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerWidth;
	} else {
		viewportwidth = document.documentElement.clientWidth;
	}
	
	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		window_width = viewportwidth;
	} else {
		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			window_width = document.body.parentNode.clientWidth;
		} else {
			window_width = document.body.parentNode.scrollWidth;
		}
	}
	
	var popUpDiv = document.getElementById(popUpDivVar);
	window_width=window_width/2-100;//150 is half popup's width
	popUpDiv.style.left = window_width + 'px';
}
function popup(windowname) {
	blanket_size(windowname);
	window_pos(windowname);
	toggle('blanket');
	toggle(windowname);
}