isIE4 = (document.all)? true:false;
isNav4 = (document.layers)? true:false;
isNav6 = (document.getElementById)? true:false;
isMac = (navigator.platform.indexOf("Mac") == -1)? false : true;
if (isIE4) isNav6 = false;



function preloadImages()
{
var d=document;
    if(d.images)
    {
        if(!d.p)
        {
            d.p=new Array();
        }

        var i,j=d.p.length,a=preloadImages.arguments;
        for(i=0; i<a.length; i++)
        {
            if (a[i].indexOf("#")!=0)
            {
                d.p[j]=new Image;
                d.p[j++].src=a[i];
            }
        }
    }
}

function findObj(n, d)
{
var p,i,x;
    if(!d)
    {
        d=document;
    }

    if((p=n.indexOf("?"))>0&&parent.frames.length)
    {
        d=parent.frames[n.substring(p+1)].document;
        n=n.substring(0,p);
    }

    if(!(x=d[n])&&d.all)
    {
        x=d.all[n];
    }

    for (i=0;!x&&i<d.forms.length;i++)
    {
        x=d.forms[i][n];
        for(i=0;!x&&d.layers&&i<d.layers.length;i++)
        {
            x=findObj(n,d.layers[i].document);
            return x;
        }
    }
}

function swapImage()
{

var i,j=0,x,a=swapImage.arguments;
document.sr=new Array;

    for(i=0;i<(a.length-2);i+=3)
    {
        if ((x=findObj(a[i]))!=null)
        {
            document.sr[j++]=x;
            if(!x.oSrc)
            {
                x.oSrc=x.src;
                x.src=a[i+1];
            }
        }
    }
}

function swap(img, to_state)
{
    eval("document." + img + ".src = " + img + to_state + ".src");
}

function swap_lyr(img, to_state, lyr)
{
    if (isNav4)
    {
        eval("document." + lyr + ".document." + img + ".src = " + img + to_state + ".src");
    } else {
        swap(img, to_state);
    }
}

function OpenLinkBrowser(strName)
{
var strURL, strReturn, strPH;
strPH = 'NCPH_' + strName;
strURL = document.forms["NC_EditForm"].elements[strPH].value;

strReturn = window.showModalDialog("/NR/fordcom/LinkBrowser/LinkBrowser.asp?NRMODE=Unpublished&wbc_caller=IEModal",
strURL, IDS_IEWIN_INTLINKS_FEATURES);

    if (strReturn != 'Cancel')
    {
        document.forms["NC_EditForm"].elements[strPH].value = strReturn;
    }
}

function check_dropdown(form_name, dd_name, err_id, lyr)
{
var error_message_1 = "Please make a selection.";
var error_message_2 = "Please make all selections.";
    if (isNav4)
    {
        if (lyr)
        {
            dropdown = eval("document." + lyr + ".document." + form_name + "." + dd_name);
        } else {
            dropdown = eval("document." + form_name + "." + dd_name);
        }
    } else {
        dropdown = eval("document." + form_name + "." + dd_name);
    }
    if ((dropdown.selectedIndex < 2) || (dropdown.options[dropdown.selectedIndex].value == ""))
    {
        dropdown.selectedIndex = 0;
        eval("alert(error_message_" + err_id + ")");
    } else {
        document.location.href = dropdown.options[dropdown.selectedIndex].value;
    }
}

function set_all_checkboxes(to_state)
{
    for (var intCntr = 0; intCntr < document.global_search.elements.length; intCntr++) {
        if (document.global_search.elements[intCntr].name.indexOf("param") == 0)
        {
            eval("document.global_search.elements[intCntr].checked = " + to_state);
        }
    }
}

function check_all_checkboxes()
{
var one_checked = false;
    for (var intCntr = 0; intCntr < document.global_search.elements.length; intCntr++)
    {
        if (document.global_search.elements[intCntr].name.indexOf("param") == 0)
        {
            if (document.global_search.elements[intCntr].checked == true)
            {
                one_checked = true;
            }
        }
    }

   if (one_checked)
   {
      document.global_search.submit();
      return true;
   } else {
      alert ("Please Select at least one collection to search");
      return false;
   }
}

////////////////////
// CENTENNIAL SCRIPTS
////////////////////


function openwin(winame,file,height,width)
{
    window.open(file,winame,"status=no,scrollbars=no,toolbar=no,location=no,menu=no,resizable=no,width="+width+",height="+height);
}

function openwinscroll(winame,file,height,width)
{
    window.open(file,winame,"status=no,scrollbars=yes,toolbar=no,location=no,menu=no,resizable=yes,width="+width+",height="+height);
}

    // Slide show

function slide(direction)
{
    current_slide += direction;
    if (current_slide < 0)
    {
        current_slide = total_slides;
    }

    if (current_slide > total_slides)
    {
        current_slide = 0;
    }

    if  (current_slide == total_slides)
    {
        document.graphic.src = eval("img_" + current_slide + ".src");
        document.thumbr.src = eval("thumbr_" + (0) + ".src");
        document.thumbl.src = eval("thumbl_" + (current_slide-1) + ".src");
    } else if (current_slide == 0) {
        document.graphic.src = eval("img_" + current_slide + ".src");
        document.thumbr.src = eval("thumbr_" + (current_slide+1) + ".src");
        document.thumbl.src = eval("thumbl_" + (total_slides) + ".src");
    } else {
        document.graphic.src = eval("img_" + current_slide + ".src");
        document.thumbr.src = eval("thumbr_" + (current_slide+1) + ".src");
        document.thumbl.src = eval("thumbl_" + (current_slide-1) + ".src");
    }
}


function showHideLayers()
{ //v3.0

var i,p,v,obj,args=showHideLayers.arguments;

    for (i=0; i<(args.length-2); i+=3)
    {
        if ((obj=findObj(args[i]))!=null)
        {
            v=args[i+2];
            if (obj.style)
            {
                obj=obj.style;
                v=(v=='show')?'visible':(v='hide')?'hidden':v;
            }
            obj.visibility=v;
        }
    }
}

// End Slide show

var centImageRef, centDivRef;
var allVar = '';

if (isIE4) {
    allVar = '.all';
}

function changeEraNav(navNum)
{
    for (i=1; i<6; i++)
    {
        centImageRef = eval('document' + allVar + '.btnEra' + i);

        // if it's not a grayed out year
        if (centImageRef.src.indexOf("_off") == -1)
        {
            if (i != navNum)
            {
                centImageRef.src = eval('era' + i + 'Off.src');
            } else {
                centImageRef.src = eval('era' + i + 'On.src');
            }
        }
    }
}

function showEra(eraNum,divTotal)
{
divTotal = divTotal + 1;
    for (i=1; i<divTotal; i++)
    {
        if (isIE4)
        {
            centDivRef = eval('document.all.divEra' + i + '.style');
        } else {
            centDivRef = eval("document.layers['divEra" + i + "']");
        }

        if (i != eraNum)
        {
           centDivRef.visibility = 'hidden';
        } else {
           centDivRef.visibility = 'visible';
        }
    }
}