function checkDonnees() {

	if (document.catVideoProj.refVideoProj.value == "") {
		alert("Choisissez un modèle de video-projecteur.");
		return false;
	}
	if (document.catVideoProj.donnees.value == "") {
		alert("Entrez une valeur pour le calcul.");
		return false;
	}
	document.catVideoProj.submit();
}

function autreDonnees() {
	if (document.catVideoProj.donnees.value == 'autre') {
		var data = prompt("Entrez la valeur :");
		document.catVideoProj.donneesAutre.value = data;
		checkDonnees()
	} else {
		document.catVideoProj.donneesAutre.value = document.catVideoProj.donnees.value;
		checkDonnees()
	}
}

function remplacEcran() {
	if (document.catVideoProj.position.value == 'Table') {
		if (document.catVideoProj.ratio.value == '1') {
			document.ecranp.src = 'http://www.son-video.com/images/static/fo-transition/Table_169.gif';
		} else {
			document.ecranp.src = 'http://www.son-video.com/images/static/fo-transition/Table_43.gif';
		}
	} else {
		if (document.catVideoProj.ratio.value == '0') {
			document.ecranp.src = 'http://www.son-video.com/images/static/fo-transition/Plafond_43.gif';
		} else {
			document.ecranp.src = 'http://www.son-video.com/images/static/fo-transition/Plafond_169.gif';
		}
	}
}

function MM_reloadPage(init) { // reloads the window if Nav4 resized
	if (init == true)
		with (navigator) {
			if ((appName == "Netscape") && (parseInt(appVersion) == 4)) {
				document.MM_pgW = innerWidth;
				document.MM_pgH = innerHeight;
				onresize = MM_reloadPage;
			}
		}
	else if (innerWidth != document.MM_pgW || innerHeight != document.MM_pgH)
		location.reload();
}
MM_reloadPage(true);

function MM_checkBrowser(NSvers, NSpass, NSnoPass, IEvers, IEpass, IEnoPass,
		OBpass, URL, altURL) { // v5.0
	var newURL = '', userAgent = navigator.userAgent, version = 0;
	if (userAgent.indexOf('Netscape') != -1) {
		version = parseFloat(userAgent.substring(
				userAgent.indexOf('Netscape') + 9, userAgent.length));
		if (version >= NSvers) {
			if (NSpass > 0)
				newURL = (NSpass == 1) ? URL : altURL;
		} else {
			if (NSnoPass > 0)
				newURL = (NSnoPass == 1) ? URL : altURL;
		}
	} else if (userAgent.indexOf('MSIE') != -1) {
		version = parseFloat(userAgent.substring(userAgent.indexOf('MSIE') + 4,
				userAgent.length));
		if (version >= IEvers) {
			if (IEpass > 0)
				newURL = (IEpass == 1) ? URL : altURL;
		} else {
			if (IEnoPass > 0)
				newURL = (IEnoPass == 1) ? URL : altURL;
		}
	} else if (OBpass > 0)
		newURL = (OBpass == 1) ? URL : altURL;
	if (newURL) {
		window.location = unescape(newURL);
		document.MM_returnValue = false;
	}
}

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 affichEcran() {
	if (document.selectProject.format.value == '169') {
		document.ecran.src = 'http://www.son-video.com/images/static/fo-transition/Table_169.gif';
	} else {
		document.ecran.src = 'http://www.son-video.com/images/static/fo-transition/Table_43.gif';
	}
}

function remplaceEcran() {
	if (document.selectProject.format.value == '') {
		document.ecran.src = 'http://www.son-video.com/images/static/fo-transition/Table_169.gif';
	}
	if (document.selectProject.format.value == '169') {
		document.ecran.src = 'http://www.son-video.com/images/static/fo-transition/Table_169.gif';
	} else {
		document.ecran.src = 'http://www.son-video.com/images/static/fo-transition/Table_43.gif';
	}
	document.selectProject.submit();
}