Javascript regular control text box can only input integers or floating point numbers_javascript skills

JS part of the code is as follows:

function CheckInputIntFloat(oInput) 
{ 
if('' != oInput.value.replace(/\d{1,}\.{0,1}\d{0,}/,'')) 
{ 
oInput.value = oInput.value.match(/\d{1,}\.{0,1}\d{0,}/) == null ? '' :oInput.value.match(/\d{1,}\.{0,1}\d{0,}/); 
} 
}

HTML part code (example):

<input type="text" id="input1" name="input1" onkeyup="javascript:CheckInputIntFloat(this);" />