/*
 *=================================================================================================
 * FILE : gp_common.js
 * DESC	: common JavaScript functions handling graphics
 * BY   : Alfred Cheong
 * HIST	:
 *				20030620 alfred cheong
 *				- hangling dynamic position in Netscape 7.x
 *
 *				20030402 alfred cheong
 *				- remove funcitons: isSCH(), SwapImg(), SwapBkgImg()
 *
 *				20030320 alfred choeng
 *				- add marcos: isNS, isIE
 *
 *				20011030 First Version
 *=================================================================================================
*/

var isIE5 = (document.all && document.getElementById) ? true : false;
var isNS6 = (!document.all && document.getElementById) ? true : false;

// Functions for image preloading, swapping
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.0
  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=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}


function SwapImage(objid, event_cd) {
	var dynObj;
	var tmpFileExt;
	var pattern=/(_ovr|_clk|_ani)?\.(gif|jpg){1}$/i;		// pattern for matching event cd + file extension
	var fileExtPattern=/\.(gif|jpg){1}$/i;				// pattern for matching file extension

	dynObj = document.getElementById(objid);

	if (dynObj != null) {
		tmpFileExt = dynObj.src.substr(dynObj.src.search(fileExtPattern));
		dynObj.src = dynObj.src.replace(pattern, event_cd + tmpFileExt);
	}
}


// 20030228
function SwapBackground(objid, event_cd) {
	var dynObj;
	var tmpFileExt, tmpBkgImg;
	var pattern=/(_ovr|_clk)?\.(gif|jpg){1}$/i;		// pattern for matching event cd + file extension
	var fileExtPattern=/\.(gif|jpg){1}$/i;				// pattern for matching file extension

	dynObj = document.getElementById(objid);

	if (dynObj != null) {
		tmpBkgImg = dynObj.getAttribute('background', 2);

		if (tmpBkgImg.search(pattern) != -1) {
			tmpFileExt = tmpBkgImg.substr(tmpBkgImg.search(fileExtPattern));
			dynObj.setAttribute('background', tmpBkgImg.replace(pattern, event_cd + tmpFileExt), 2);
		}
	}
}

// 20030221
function showObjects() {
	for (var i=0; i<showObjects.arguments.length; i++) {
		showObj(showObjects.arguments[i]);
	}
}

// 20030221
function hideObjects() {
	for (var i=0; i<hideObjects.arguments.length; i++) {
		hideObj(hideObjects.arguments[i]);
	}
}

function showObj(objID) {
	var dynObj;

	dynObj = document.getElementById(objID);
	if (dynObj != null) {
		if (dynObj.style.visibility=='hidden')	{
			dynObj.style.visibility='visible';
		}
	}
}


function hideObj(objID) {
	var dynObj;

	dynObj = document.getElementById(objID);
	if (dynObj != null) {
		if (dynObj.style.visibility=='visible')	{
			dynObj.style.visibility='hidden';
		};
	}
}


function popup_noframe_withsize(theURL, h, w){
	window.open(theURL,null,"top=0,left=0,height=" + h + ",width=" + w + ",status=no,toolbar=no,menubar=yes,location=no,scrollbars=yes");
}


function IEGetOffsetLeft(objID, NSDiff, flagNS) {
	// bypass Netscape 7
	if ((flagNS) && (navigator.userAgent.search(/Netscape\/7/i)==-1)) {
		return document.getElementById(objID).offsetLeft - NSDiff;
	} else {
		return document.getElementById(objID).offsetLeft;
	}
}

function IEGetOffsetTop(objID, NSDiff, flagNS) {
	// bypass Netscape 7
	if ((flagNS) && (navigator.userAgent.search(/Netscape\/7/i)==-1)) {
		return document.getElementById(objID).offsetTop - NSDiff;
	} else {
		return document.getElementById(objID).offsetTop;
	}
}

if (document.location.host=="www1.vst.jobs.gov.hk"||document.location.host=="sc1.jobs.gov.hk") {
	var kanhan_server="sc1.jobs.gov.hk";
	var kanhan_server_search=eval("/sc1\.jobs\.gov\.hk{1}/ig");
	var vst_server="www1.vst.jobs.gov.hk";
	var ies_server="www1.jobs.gov.hk";
}
else if (document.location.host=="www2.vst.jobs.gov.hk"||document.location.host=="sc2.jobs.gov.hk") {
	var kanhan_server="sc2.jobs.gov.hk";
	var kanhan_server_search=eval("/sc2\.jobs\.gov\.hk{1}/ig");
	var vst_server="www2.vst.jobs.gov.hk";
	var ies_server="www2.jobs.gov.hk";
}
else {
	var kanhan_server="sc.jobs.gov.hk";
	var kanhan_server_search=eval("/sc\.jobs\.gov\.hk{1}/ig");
	var vst_server="www.vst.jobs.gov.hk";
	var ies_server="www.jobs.gov.hk";
} 
 

/*
 * DESC	: - handle swapping of image to other chinese version
 */
function SwapChiVersionImageAlt(chiImgName) {
	var schHost=kanhan_server_search;

	if (document.location.host.search(schHost)==0){
		for (var i=0; i<document.images.length; i++) {
			if (document.images[i].name == chiImgName) {
				document.images[i].alt = 'ÁcÅ骩';
				document.images[i].title = 'ÁcÅ骩';
			}
		}
	}
	return true;
}



/*
 * DESC	: - handle swapping of link to other chinese version
 */
function SwapChiVersionLink(linkObj) {
	var schURLPortion=this.kanhan_server+"/gb/";
	var schHost=kanhan_server_search;	
	if (document.location.host.search(schHost)==0){
		linkObj.href=linkObj.href.replace(schURLPortion, '');		
	}
	return true;
}

function changeToGB(str)
{			
	return str;	
}