function LTrim(s) {
 return s.replace(/^\s+/g,"");
}

function RTrim(s) {
 return s.replace(/\s+$/g,"");
}

function Trim(s)  {
 return LTrim(RTrim(s));
}

function Len(s) {
 var s1 = Trim(s);
 return s1.length;
}

function onlyNumChk(t){

	if(t.value.match(/[^0-9]/)) 
	{ 
	  window.alert('¼ýÀÚ¸¸ ÀÔ·ÂÇØÁÖ¼¼¿ä.'); 
	  this.value = ''; 
	  return; 
	 } 
}