var getById = (typeof document.getElementById != "undefined");		
function setClassName(obj, className){
		getRef(obj).className= className;
}

function getRef(obj){
		if(getById)
			return(typeof obj == "string") ? document.getElementById(obj) : obj;
}

function justNum(max, field) {
	if (!/^\d+$/.test(field.value)) { //digits only
	field.value = '';
	return false;
	}
}

function checkParm(){
	var sHere = document.location.href;
	//see if parameter exists
	if(sHere.indexOf("?tab=") != -1){
		var parm = sHere.substring(sHere.indexOf("?tab=")+5,sHere.indexOf("?tab=")+6); //extract parm
		setClassName('tab','tab'+parm);setClassName('grps','grp'+parm);}
		else{setClassName('tab','tab1');setClassName('grps','grp1');}
}

function ssPup(where) {
	newWindow = window.open(where,'ssPup','width=600,height=560,top=20,left=20,toolbar=0,location=0,directories=0,status=0,menuBar=0,scrollBars=1,resizable=1'); 
	newWindow.focus();
}