var win = null;
function fenetre(mypage,myname,w,h,scroll,no)
{
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable='+no+''
	win = window.open(mypage,myname,settings)
	if(win.window.focus){win.window.focus();}
}

function clearText(thefield) {
	if (thefield.defaultValue==thefield.value)
	thefield.value = ""
}



function toggleVisibility(id) {
	e = document.getElementById(id);
	if (e.style.visibility == "visible") {
		e.style.display = "none";
		e.style.visibility = "hidden";
	} else {
		e.style.display = "block";
		e.style.visibility = "visible";
	}
	
}

function rosette(f) { 
	var field = document.getElementById(f);
	if(eval(field.value)>=1) {
		field.value=0; 
	}
} 
function more(f) { 
	var field = document.getElementById(f);
	field.value++; 
} 
function less(f) { 
	var field = document.getElementById(f);
	if(eval(field.value)>=1) {
		field.value--; 
	}
} 
function updateField(field,value) { 
	document.forms["mainform"].elements[field].value=value;
}