function GoTo(docNumber)
{
	var eString = "&EXPAND=";
	var eLength = eString.length;
	
	var cString = "&COLLAPSE=";
	var cLength = cString.length
	var baseURL = document.location.href;
	var baseURLUpperCase = baseURL.toUpperCase();
	var eBeg = baseURLUpperCase.indexOf(eString);
		
	if (eBeg > 0) {
		var otherStuff = baseURL.substring(eBeg + eLength, baseURL.length);
		var otherStuffBeg = otherStuff.indexOf("&");
		if (otherStuffBeg >= 0) {
			eNumber = otherStuff.substring(0, otherStuffBeg);
			otherStuff = otherStuff.substring(otherStuffBeg, otherStuff.length);
		} else {
			eNumber = otherStuff.substring(0, otherStuff.length);
			otherStuff = "";
		}
		if (eNumber == docNumber) {	// need to collapse
			goWhere = baseURL.substr(0, eBeg) + cString + docNumber + otherStuff;
		} else {								// do not need to colapse
			goWhere = baseURL.substr(0, eBeg) + eString + docNumber + otherStuff;
		}
	} else {			// no EXPAND in the string
		var cBeg = baseURLUpperCase.indexOf(cString);
		if (cBeg > 0) {
			var otherStuff = baseURL.substring(cBeg + cLength, baseURL.length)
			var otherStuffBeg = otherStuff.indexOf("&");
			if (otherStuffBeg >= 0) { 		// other stuff in the string
				goWhere = baseURL.substr(0, cBeg) + eString + docNumber + otherStuff.substring(otherStuffBeg, otherStuff.length)
			} else {		// nothing else in the string so just expand
				goWhere = baseURL.substr(0, cBeg)  + eString + docNumber;
			}
		} else {		// no COLLAPSE in the string
			goWhere = baseURL + eString + docNumber;
		}
	}
//	alert (goWhere);
	if (document.location.href.indexOf("&REF") == "-1") { goWhere = goWhere  + "&REF" }
	document.location =  goWhere;
};