var arrimgOn = new Image();
arrimgOn.src = 'images/rarrow.gif';

var arrimgOff = new Image();
arrimgOff.src = 'images/rarrow_off.gif';



function arrOn(index)
{
	if(index != 0)
	{
		eval('document.images["arr' + index + '"].src = arrimgOn.src;');
	}
}

function arrOff(index)
{
	if(index != 0)
	{
		eval('document.images["arr' + index + '"].src = arrimgOff.src;');
	}
}

//popup window inside the frame


function openWinSmall()
{
    centerLayerOnScreen(document.all.popupwin);
    document.all.popupwin.style.visibility = 'visible';
}

function closeWinSmall()
{
    document.all.popupwin.style.visibility = 'hidden';
}

function centerLayerOnScreen(layer)
{
    var h = screen.height;
    var w = screen.width;

    var newX = (w/2 - layer.style.width/2)/2;
    var newY = (h/2 - layer.style.height/2)/2 - 100;
    
    if(document.layers) layer.moveTo(newX, newY);
    if(document.all) {layer.style.left = newX; layer.style.top = newY;}
}


function checkRegUser()
{
    var f = document.forms['freesample'];
    var name = f.FullName.value;
    var mail = f.email.value;
    
    if (!name || name == '' || !mail || mail == '' || mail.indexOf('@') < 0)
    {
        alert("Please, enter a valid name and e-mail address!");
        return;   
    }
    document.forms['freesample'].submit();
}

function checkNewUser()
{
    var f = document.forms['freesample'];
    var name = f.FullName.value;
    var mail = f.email.value;
    
    if (!name || name == '' || !mail || mail == '' || mail.indexOf('@') < 0)
    {
        alert("Please, enter a valid name and e-mail address!");
        return;   
    }
    document.forms['freesample'].submit();
}