/** global functions */
function gebi(obid){
	return document.getElementById(obid);
}

function trim(str, chars) {
	return ltrim(rtrim(str, chars), chars);
}

function ltrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

function rtrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}

function clearField(ob, value){
	if(ob.value==value){
		ob.value = '';
	}else{
		if(ob.value==''){
			ob.value = value;
		}
	}
}