// JavaScript Document

function validate_required(field)
{
	with (field)
	{
		if (value==null||value=="")
		{
			return false;
		} else {
			field.focus();
			return true;
		}
	}
}
function validate_expression(field, expr)
{
	var ex = '';
	switch (expr) {
		case 'alpha':
			ex = /^[a-zA-Z ]+$/;
			break;
		case 'number':
			ex  = /^[0-9]+$/;
			break;
		case 'alphanum':		
			ex = /^[0-9a-zA-Z ]+$/;
			break;
		case 'email':
			ex = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-Z0-9]{2,4}$/;	
			break;
		default: // alpha
			ex = /^[a-zA-Z ]+$/;
			break;
	}

	var val = field.value.replace(/ /,'');
	if (val.match(ex)) {
		return true;	
	} else {
		field.focus();
		return false;
	}
}

function compare_values(field_a, field_b) {
	if (field_a.value == field_b.value) {
		return true;
	} else {
		field_a.focus();
		return false;
	}
}

function confirm_delete(obj_name, id, page) {
	if (confirm("Are you sure you want to delete " + obj_name + "?")) {
		window.location.href = page + "?id=" + id + "&action=remove";
	}
}


function swapClass(elem, val) {
	document.getElementById(elem).className = val;
}
/* BEGIN GALLERY SCROLL */
function setImage(elem, pos) {
	elem.src = './assets/images/thumb/' + imgs[pos] + '/';	
	elem.alt = caps[pos];
}
function setHref(elem, pos) {
	elem.href = './gallery/' + refs[pos] + '.html';
}
function scrollBack() {
	var start = document.getElementById('imgStart');
	//var end = document.getElementById('imgEnd');
	var img0 = document.getElementById('imgScroll0');
	var img1 = document.getElementById('imgScroll1');
	var img2 = document.getElementById('imgScroll2');
	var lnk0 = document.getElementById('lnkScroll0');
	var lnk1 = document.getElementById('lnkScroll1');
	var lnk2 = document.getElementById('lnkScroll2');
	var pos = start.value;

	if(pos == 0)
		pos = imgs.length;
	pos--;
	setImage(img0, pos);
	setHref(lnk0, pos);
	start.value = pos;
	pos++;

	if(pos >= (imgs.length))
		pos = 0;
	setImage(img1, pos);
	setHref(lnk1, pos);
	pos++;

	if(pos >= (imgs.length))
		pos = 0;	
	setImage(img2, pos);
	setHref(lnk2, pos);

}
function scrollAhead() {
	var start = document.getElementById('imgStart');
	//var end = document.getElementById('imgEnd');
	var img0 = document.getElementById('imgScroll0');
	var img1 = document.getElementById('imgScroll1');
	var img2 = document.getElementById('imgScroll2');
	var lnk0 = document.getElementById('lnkScroll0');
	var lnk1 = document.getElementById('lnkScroll1');
	var lnk2 = document.getElementById('lnkScroll2');
	var pos = start.value;
	if(pos >= imgs.length-1)
		pos = -1;
	pos++;

	setImage(img0, pos);
	setHref(lnk0, pos);
	start.value = pos;
	pos++;

	if(pos >= imgs.length-1)
		pos = 0;
	setImage(img1, pos);
	setHref(lnk1, pos);
	pos++;

	if(pos >= imgs.length-1)
		pos = 0;	
	setImage(img2, pos);
	setHref(lnk2, pos);
}
/* END GALLERY SCROLL */


/* BEGIN PRELOAD IMAGES FUNCTIONS */
function MM_swapImgRestore()
{
  var i;
  if(document.MM_sr) for(i=0; i < document.MM_sr.length; i++)
    if(document.MM_sr[i] && document.MM_sr[i].oSrc)
	  document.MM_sr[i].src = document.MM_sr[i].oSrc;
}

function MM_preloadImages()
{
  var i,j;

  if(!document.MM_p) document.MM_p = new Array();

  for(i = 0, j = document.MM_p.length; i < MM_preloadImages.arguments.length; i++) if(MM_preloadImages.arguments[i].indexOf("#") != 0)
  {
    document.MM_p[j] = new Image;
    document.MM_p[j].src = MM_preloadImages.arguments[i];
    j++;
  }
}

function MM_swapImage(o, m)
{
  var x = document.getElementById(o);
  document.MM_sr = new Array;
  if(x)
  {
    document.MM_sr[0] = x;
    x.oSrc = x.src;
    x.src = m;
  }
}

function MM_swapImages(o, m)
{
  var x,i,j;
  document.MM_sr = new Array;
  if(o.length != m.length) return;
  for(i = 0, j = 0; i < o.length; i++)
  {
    x = document.getElementById(o[i]);
    if(x)
    {
      document.MM_sr[j] = x;
      x.oSrc = x.src;
      x.src = m[i];
	  j++;
    }
  }
}
/* END PRELOAD IMAGES FUNCTIONS */