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++;
        }
    }
} 

function shiftOpacity(id, millisec) {
    //if an element is invisible, make it visible, else make it ivisible
    if(document.getElementById(id).style.opacity == 0) {
        opacity(id, 0, 100, millisec);
    } else {
        opacity(id, 100, 0, millisec);
    }
} 

//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 undo(element)
	{
		document.getElementById('buttons').style.display="none";
		slidedown('buttons');
		document.getElementById('body').style.background='url(centerbg1.jpg) top left repeat-x #fff';
		document.getElementById('mainText').style.display="";
		shiftOpacity(element + 'text', 1000);
		shiftOpacity(element + 'text2', 1000);
		document.getElementById(element + 'text').style.display='none';
		document.getElementById(element + 'text2').style.display='none';
		document.getElementById('leftnav').style.display="";
		document.getElementById('rightnav').style.display="";
	}
	
	function toggleArrow(int)
	{
		if(int == '1') { 
			document.getElementById('fullMenu').style.display='';
			document.getElementById('fullMenu').style.visibility='visible';
			document.getElementById('downarrow').style.display="none"; 
			document.getElementById('downarrow2').style.display=""; 
			slidedown('fullMenu'); 
		}
		
		if(int == '0') { 
			document.getElementById('fullMenu').style.display='none';
			document.getElementById('fullMenu').style.visibility='hidden';
			document.getElementById('downarrow').style.display=""; 
			document.getElementById('downarrow2').style.display="none"; 
		}
	}