function opacity(id, opacStart, opacEnd, millisec) {
    //speed for each frame
    var speed = Math.round(millisec / 100);
    var timer = 0;

    //determine the direction for the blending, if start and end are the same nothing happens
    if(opacStart > opacEnd) {
        for(i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    }
}
//change the opacity for different browsers
function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
} 
function toggle(obj) {
	var o = document.getElementById(obj);
	if (o.style.display == 'none')
	{
		o.style.display = 'block';
	}
	
	else if (o.style.display == 'block')
	{

		o.style.display = 'none';
	}
}
function page(obj) {
	if (document.getElementById('shader').style.display == 'none')
	{
		document.getElementById('shader').style.display = 'block';
		document.getElementById('menu').style.display = 'block';
		opacity('shader', 0, 50, 500);
	}
}
function closepage(obj) {
	{
		document.getElementById('shader').style.display = 'none';
		document.getElementById('menu').style.display = 'none';
		opacity('shader', 50, 0, 500);
		
	}
}