pic = 1;
prev = '';

function fadePrev() {
	prev = 'thumb' + pic;
	pic -=1;
	if (pic < 1) { pic = 5; };
	display = 'thumb' + pic;
	fade(prev, display);
	
}

function fadeNext() {
	prev = 'thumb' + pic;
	pic += 1;
	if(pic > 5) { pic = 1; };
	display = 'thumb' + pic;
	fade(prev, display);
}

function fade(a,b) {
	opacity(a, 100, 0, 500);
	document.getElementById(a).style.display = 'none';
	document.getElementById(b).style.display = 'block';
	opacity(b, 0, 100, 500);
}


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 changeOpac(opacity, id) {
	var object = document.getElementById(id);
	object.style.opacity = (opacity / 100);
	object.style.MozOpacity = (opacity / 100);
	object.style.KhtmlOpacity = (opacity / 100);  
}

/*-------------------
FORM CHECK
--------------------*/

function isEmail(string) {
	if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
	{document.getElementById('response').innerHTML = "";
	}
	else {
		if (document.getElementById('email').value != ""){
	document.getElementById('email').value = "";
	document.getElementById('response').innerHTML = "We didn't recognize your email address.";
	} else {document.getElementById('response').innerHTML = "";}
	}
}
function checkForm() {

	var answer = "";
	  if (document.getElementById('name').value == "") {answer += "Please enter your name. "};
	  if (document.getElementById('email').value == "") {answer += "Please enter your email address. "};
	  if (document.getElementById('message').value == "") {answer += "Please enter a message. "};
	  
 	  if (answer > "") {answer = "Some required fields were left blank. " + answer; 
	  document.getElementById('response').innerHTML = answer;
	  return false;
	  } 
	  else {
	  document.getElementById('response').innerHTML = "";
	  return true;}
}