function checkLength(obj) 
{ 
var valueObj = obj.value;
//alert(valueObj) ;
valueObj = valueObj.replace(/\D/g, "");
//alert(valueObj) ;
var content1 = valueObj.substr(0,6); 
var content2 = valueObj.substr(6,4); 
var content3 = valueObj.substr(10,4); 
var content4 = valueObj.substr(14,6); 
/*
alert(content1);
alert(content2);
alert(content3);
alert(content4);
*/
document.forms[0].elements['1'].value = content1; 
document.forms[0].elements['2'].value = content2; 
document.forms[0].elements['3'].value = content3; 
document.forms[0].elements['4'].value = content4; 
/* document.forms[0].elements['submit'].focus() ; */
}