/*
	Standards Compliant Rollover Script
	Author : Daniel Nolan
	http://www.bleedingego.co.uk/webdev.php
	
	Add the attribute class="imgover" to any image in your document that requires a mouseover effect to be trigger
        Hover image is named exactly the same as the original image plus _o at the end of name
*/

function initRollovers() {

	if (!document.getElementById) return
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByTagName('img');

	for (var i = 0; i < aImages.length; i++) {		
	
		//there may be multiple class assignments
		//separates the img class into an array
		classes = aImages[i].className.split(" ");
				
		//checks if img has a class of menu
		//if so, set up rollover
		if ( inArray('imgover', classes) ) {

			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_o'+ftype);

			aImages[i].setAttribute('hsrc', hsrc);
			
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;
			
			aImages[i].onmouseover = function() {
				sTempSrc = this.getAttribute('src');
				this.setAttribute('src', this.getAttribute('hsrc'));
			}	
			
			aImages[i].onmouseout = function() {
				if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_o'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}

		}
	}
}

function inArray( value, array ) {
//passed a value and an array, this function returns true
//if the value is contained within the array,
//false if it is not

	for ( var i = 0; i < array.length; i++ )
		if ( array[i] == value )
			return true;
	return false;
} 

//adds functions to the windows onload event
function addOnload(newFunction) {
  var oldOnload = window.onload;
    // does window.onload exist
  if (typeof oldOnload == "function") {
            //overwriting existing onload
              window.onload = function() {
                  if (oldOnload) {oldOnload();}
                  newFunction();
              }
          }
          else {
              window.onload = newFunction;
          }
} 

addOnload(initRollovers);


/***This one does the instant popdowns***/
            
        function showhide_pref(which)
        {
        	off = which + '_off';
        	on  = which + '_on';
        
			if (document.getElementById(off).style.display == "block")
			{
				document.getElementById(off).style.display = "none";
				document.getElementById(on).style.display = "block";				
        	}
        	else
        	{
				document.getElementById(off).style.display = "block";
				document.getElementById(on).style.display = "none";
        	}
        }
    
	
		var chunk	= new Array(1);
		chunk[0]  = "search";
		chunk[1]  = "vet_login";
		chunk[2]  = "more";

		
		var state = 'closed';
		
		function showhide_chunk()
		{
			for (i = 0 ; i < chunk.length; i++ )
			{								
				off = chunk[i] + '_off';
				on  = chunk[i] + '_on';
				
				if (state == 'closed' && document.getElementById(off).style.display)
				{
					document.getElementById(off).style.display = "block";
					document.getElementById(on).style.display = "none";	
				}
				else
				{
					document.getElementById(off).style.display = "none";
					document.getElementById(on).style.display = "block";
				}
			}
			
			if (state == 'closed')
				state = 'open';
			else
				state = 'closed';
		}





/*
	Form Manager: A simple method of constructing complex dynamic forms.
	Written by Twey, http://www.twey.co.uk/.
	Use, copying, and modification allowed, so long as credit
	remains intact, under the terms of the GNU General Public License,
	version 2 or later. See http://www.gnu.org/copyleft/gpl.html for details.
*/



var FORM_MANAGER_CONDITION_SEPARATOR = " AND ";
var FORM_MANAGER_POSSIBILITY_SEPARATOR = " OR ";
var FORM_MANAGER_NAME_VALUE_SEPARATOR = " BEING ";
var FORM_MANAGER_DEPENDS = "DEPENDS ON ";
var FORM_MANAGER_CONFLICTS = "CONFLICTS WITH ";
var FORM_MANAGER_EMPTY = "EMPTY";

function addEvent(el, ev, f) {
  if(el.addEventListener)
    el.addEventListener(ev, f, false);
  else if(el.attachEvent) {
    var t = function() {f.apply(el);};
    addEvent.events.push({'element': el, 'event': ev, 'handler': f});
    el.attachEvent("on" + ev, t);
  } else
    el['on' + ev] = f;
}

function addEvents(els, evs, f) {
  for(var i = 0; i < els.length; ++i)
    for(var j = 0; j < evs.length; ++j)
      addEvent(els[i], evs[j], f);
}

addEvent.events = [];

if(typeof window.event !== "undefined")
  addEvent(window, "unload", function() {
      for(var i = 0, e = addEvent.events; i < e.length; ++i)
        e[i].element.detachEvent("on" + e[i].event, e[i].handler);
    }
  );

function getRadioValue(el) {
  if(!el.length) return null;
  for(var i = 0; i < el.length; ++i)
    if(el[i].checked) return el[i].value;
  return null;
}

function getSelectValue(el) {
  if(!el.tagName  || el.tagName.toLowerCase() !== "select")
    return null;
  return el.options[el.selectedIndex].value;
}

function isElementValue(el, v) {
  if(v === FORM_MANAGER_EMPTY) v = '';
  return (
    getRadioValue(el) == v ||
    getSelectValue(el) == v ||
    (
      el.tagName &&
      el.tagName.toLowerCase() !== "select" &&
      el.value == v
    )
  );
}

function setupDependencies() {
  var showEl = function() {
    this.style.display = "";
    if(this.parentNode.tagName.toLowerCase() == "label")
      this.parentNode.style.display = "";
  };
  var hideEl = function() {
    this.style.display = "none";
    if(typeof this.checked !== "undefined") this.checked = false;
    else this.value = "";
    if(this.parentNode.tagName.toLowerCase() == "label")
      this.parentNode.style.display = "none";
    this.hidden = true;
  };
  var calcDeps = function() {
    for(var i = 0, e = this.elements; i < e.length; ++i) {
      e[i].hidden = false;
      for(var j = 0, f = e[i].className.split(FORM_MANAGER_CONDITION_SEPARATOR); j < f.length; ++j)
        if(f[j].indexOf(FORM_MANAGER_DEPENDS) === 0) {
          for(var k = 0, g = f[j].substr(FORM_MANAGER_DEPENDS.length).split(FORM_MANAGER_POSSIBILITY_SEPARATOR); k < g.length; ++k)
            if(g[k].indexOf(FORM_MANAGER_NAME_VALUE_SEPARATOR) === -1) {
	      if(e[g[k]] && e[g[k]].checked) break;
            else if(k + 1 == g.length)
                e[i].hide();
            } else {
              var n = g[k].split(FORM_MANAGER_NAME_VALUE_SEPARATOR),
                v = n[1];
              n = n[0];
	      if(e[n])
	        if(isElementValue(e[n], v)) break;
	        else if(k + 1 == g.length) e[i].hide();
	    }
        } else if(f[j].indexOf(FORM_MANAGER_CONFLICTS) === 0) {
          if(f[j].indexOf(FORM_MANAGER_NAME_VALUE_SEPARATOR) === -1) {
	    if(e[f[j].substr(FORM_MANAGER_CONFLICTS.length)] && e[f[j].substr(FORM_MANAGER_CONFLICTS.length)].checked) {
              e[i].hide();
              break;
            }
          } else {
            var n = f[j].substr(FORM_MANAGER_CONFLICTS.length).split(FORM_MANAGER_NAME_VALUE_SEPARATOR),
              v = n[1];
            n = n[0];
            if(e[n]) {
              if(isElementValue(e[n], v)) {
                e[i].hide();
                break;
              }
            }
          }
        }
      if(!e[i].hidden) e[i].show();
    }
  };
  var changeHandler = function() {
    this.form.calculateDependencies();
    return true;
  };
  for(var i = 0; i < arguments.length; ++i) {
    for(var j = 0, e = window.document.forms[arguments[i]].elements; j < e.length; ++j) {
      addEvents([e[j]], ["change", "keyup", "focus", "click", "keydown"], changeHandler);
      e[j].hide = hideEl;
      e[j].show = showEl;
    }

    (e = window.document.forms[arguments[i]]).calculateDependencies = calcDeps;
    e.calculateDependencies();
  }
}