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dhtmlxcombo decimal numeric validation

Thanks, except I'm validating for numbers with decimar places too.  What do I add to prevent it from automatically removing the decimal point every time I enter an illegal character (i.e. a letter)

Thanks,
Graham.

Just add decimal point to regexp mask

function checkNumbersOnly(val) { 
  if (val < 48 || val > 57 ){ 
  alert('PLEASE NOTE: You can only type numbers in this field'); 
  z1.setComboText(z1.getComboText().toString().replace(/[^0-9.]+/g,""))
  } 
}

or 
function checkNumbersOnly(val) { 
  if (val < 48 || val > 57 ){ 
  alert('PLEASE NOTE: You can only type numbers in this field'); 
  z1.setComboText(parseFloat(z1.getComboText()))
  } 
}