function isEmpty(inp) {
	if (inp == null || inp == "") {
		return true;
	}
	return false;
}

function isPosInteger(inp) {
	var inpStr = inp.toString();
	for (var i = 0; i < inpStr.length; i++) {
		var oneChar = inpStr.charAt(i);
		if (oneChar < "0" || oneChar > "9") {
			return false;
		}
	}
	return true;
}

function chkForm(sForm) {
	var sStr = sForm.txtSearchParam.value;
	if (isEmpty(sStr)) {
		return false;
	}
	if (isPosInteger(sStr) && sStr.length <= 8) {
		sForm.stp.value = 1;
	}
	return true;
}

function submitForm(sForm) {
	if (chkForm(sForm)) {
		sForm.submit();
		return true;
	}
	return false;
}

var bbSrhN, nbSrhH, nbSrhD;

function newImage(arg) {
	var rslt;
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function chImg(img, src) {
    img.src = 'images/' + src;
}

var preloadFlag = false;
function preloadImages() {
	var rImg, path;
	if (document.images) {
		rImg = document.getElementById("nbSrh");
		path = rImg.src.substr(0, rImg.src.length-12)
		nbSrhN = newImage(path + "nb-srh-n.gif");
		nbSrhH = newImage(path + "nb-srh-h.gif");
		nbSrhD = newImage(path + "nb-srh-d.gif");
		preloadFlag = true;
	}
}