javascript numeric num number inputmask, round()

v_html=v_html+' onkeyup=" NumericFormat(this) " '

v_html=v_html+' onchange=" NumericFormat(this) " '



function NumericFormat(input){
var num = input.value.replace(/\,/g,'');
if(!isNaN(num)){
if(num.indexOf('.') > -1){
num = num.split('.');
num[0] = num[0].toString().split('').reverse().join('').replace(/(?=\d*\.?)(\d{3})/g,'$1,').split('').reverse().join('').replace(/^[\,]/,'');
if(num[1].length > 2){
  alert('You may only enter two decimals!');
  num[1] = num[1].substring(0,num[1].length-1);
  }  input.value = num[0]+'.'+num[1];      
}
else{ input.value = num.toString().split('').reverse().join('').replace(/(?=\d*\.?)(\d{3})/g,'$1,').split('').reverse().join('').replace(/^[\,]/,'') };
}
else{ alert('You may enter only numbers in this field!');
input.value = input.value.substring(0,input.value.length-1);}}

function NumericFormat(input){
var num = input.value.replace(/\,/g,'');
if(!isNaN(num)){
if(num.indexOf('.') > -1){
num = num.split('.');
num[0] = num[0].toString().split('').reverse().join('').replace(/(?=\d*\.?)(\d{3})/g,'$1,').split('').reverse().join('').replace(/^[\,]/,'');
if(num[1].length > 2){
  alert('You may only enter two decimals!');
  num[1] = num[1].substring(0,num[1].length-1);
  }  input.value = num[0]+'.'+num[1];       
}
else{ input.value = num.toString().split('').reverse().join('').replace(/(?=\d*\.?)(\d{3})/g,'$1,').split('').reverse().join('').replace(/^[\,]/,'') };
}
else{ alert('You may enter only numbers in this field!');
input.value = input.value.substring(0,input.value.length-1);}}