function preload(imgObj,imgSrc) {
	if (document.images) {
		eval(imgObj+' = new Image()')
		eval(imgObj+'.src = "'+imgSrc+'"')
	}
}
function changeImage(layer,imgName,imgObj) {
	if (document.images) {
		if (document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src')
		else document.images[imgName].src = eval(imgObj+".src")
	}
}

function Radio(layer,imgNames,length,defaultValue) {
	this.layer = layer
	this.imgNames = imgNames
	this.length = length
	this.change = RadioChange
	this.value = (defaultValue)? defaultValue : "undefined"
}
function RadioChange(index,value) {
	this.value = value
	for (var i=0; i<this.length; i++) changeImage(this.layer,this.imgNames+i,'radio0')
	changeImage(this.layer,this.imgNames+index,'radio1')
}

function CheckBox(layer,imgName,trueValue,falseValue,defaultToTrue) {
	this.layer = layer
	this.imgName = imgName
	this.trueValue = trueValue
	this.falseValue = falseValue
	this.state = (defaultToTrue) ? 1 : 0
	this.value = (this.state) ? this.trueValue : this.falseValue
	this.change = CheckBoxChange
}
function CheckBoxChange() {
	this.state = (this.state) ? 0 : 1
	this.value = (this.state) ? this.trueValue : this.falseValue
	changeImage(this.layer,this.imgName,'checkbox'+this.state)
}

function control_leform(){
	document.theform.sw.value = screen.width;
	document.theform.sh.value = screen.height;

	var msg_err='';
	var vpass = document.theform.pass.value.toLowerCase();
	var vpseudo = document.theform.pseudo.value.toLowerCase();

	if (vpass == ''){
  	msg_err = '- Le champ "mot de passe" est vide.';
  	document.theform.pass.focus();
	}
	if (vpseudo == '' || vpseudo == 'votre pseudo'){
  	msg_err = '- Le champ "pseudo" est vide.\n'+msg_err;
  	document.theform.pseudo.focus();
	}
  if (msg_err!=''){
    alert('ERREUR!\n\n'+msg_err);
    return false;
  }
  document.getElementById('loading').style.visibility='visible';
  return true;
}