function ValidateNo(NumStr, String) 
{ 
    for(var Idx=0; Idx<NumStr.length; Idx++) 
    { 
        var Char = NumStr.charAt(Idx); 
        var Match = false; 

        for(var Idx1=0; Idx1<String.length; Idx1++) 
        { 
            if(Char == String.charAt (Idx1)) 
                Match = true; 
        } 

        if (!Match) 
            return false; 
    } 
    return true; 
} 

 



<!--
function validateEmail(email){	
	var regEx = /^[\w\.\+-]{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,6}$/;
	if (!regEx.test(email)) {
		return false;
	} 
return true;
}

function createXmlHttpObject() {
  var req = null;
  try {
    req = new XMLHttpRequest(); //ie7, ff, safari
  }
  catch (e) {
    try {
      req = new ActiveXObject("Msxml2.XMLHTTP"); //later ie
    }
    catch (e) {
      try {
        req = new ActiveXObject("Microsoft.XMLHTTP") // earlier ie
      }
      catch (e) {
        // could not create XMLHttpRequest object
        return false;
      }
    }
  }
  return req;
}

function feedback() {
	var ycmpname=document.getElementById('cmpname').value;
	var yfsa=document.getElementById('fsano').value;
	var ytitle=document.getElementById('title').value;
	var yfname=document.getElementById('fname').value;
	var ysurname=document.getElementById('surname').value;
	var yposition=document.getElementById('position').value;
	var ycontactno=document.getElementById('contactno').value;
	var yemail=document.getElementById('email').value;
	var yaddress=document.getElementById('address').value;
	var ycmbFsad=document.getElementById('cmbFsad').value;
	var ycmbFsad0=document.getElementById('cmbFsad0').value;
	var ycmbFsad1=document.getElementById('cmbFsad1').value;
	
	if((ycmpname =='') || (yfsa =='') || (yfname =='') || (ysurname =='') || (yposition =='') || (ycontactno =='') || (yemail =='')){ 
		alert('You must enter all fields');
		document.getElementById('cmpname').style.border = '1px #3a3a3a solid';
		document.getElementById('fsano').style.border = '1px #3a3a3a solid';
		document.getElementById('fname').style.border = '1px #3a3a3a solid';
		document.getElementById('surname').style.border = '1px #3a3a3a solid';
		document.getElementById('position').style.border = '1px #3a3a3a solid';
		document.getElementById('contactno').style.border = '1px #3a3a3a solid';
		document.getElementById('email').style.border = '1px #3a3a3a solid';
		return false; 
	}
	if(!ValidateNo(document.getElementById('contactno').value,"1234567890+- ")) 
    { 
        alert("Please Enter Only Number"); 
        document.getElementById('contactno').focus(); 
        return false; 
    } 
/*
	if (isNaN(ycontactno)) {
	
		//if ( (parseInt(mytext1) != mytext1) ) { 
		alert("Please Write you Contact number."); 
		document.getElementById('contactno').focus(); 
		//mytext1.select();
		return false; 
	} 
*/
	var params="feedback=1&cmpname="+ycmpname+"&fsan="+yfsa+"&titl="+ytitle+"&name="+yfname+"&srname="+ysurname+"&pstion="+yposition+"&contactn="+ycontactno+"&email="+yemail+"&adrs="+yaddress+"&cmb="+ycmbFsad+"&cmb0="+ycmbFsad0+"&cmb1="+ycmbFsad1;
	//alert(params);
	if(validateEmail(yemail)){
		objXMLHttp=createXmlHttpObject();
		
		if (objXMLHttp==null) {
			alert ('Your browser does not support the XMLHttpRequest object!');
			return;
		}
		//alert(params);
		var url='register.php?'+params; // prevent caching
		objXMLHttp.onreadystatechange = result;
		objXMLHttp.open('GET',url,true); // GET method
		objXMLHttp.send(null); // always use null for GET method
	} else {
		alert('Your Email address is not correct');
		return false;
	}
}

function result()
{
  if (objXMLHttp.readyState == 0)  {
    document.getElementById("status").innerHTML = "Sending mail, please wait...<br/><img src=\"loading.gif\" />"; //uninitialized
  }
  else if(objXMLHttp.readyState == 1)  {
    document.getElementById("status").innerHTML = "Sending mail, please wait...<br/><img src=\"loading.gif\" />"; //loading
  }
  else if(objXMLHttp.readyState == 2)  {
    document.getElementById("status").innerHTML = "Sending mail, please wait...<br/><img src=\"images/indicator.gif\" /> "; //loaded
  }
  else if(objXMLHttp.readyState == 3)  {
    document.getElementById("status").innerHTML = "Sending mail, please wait...<br/><img src=\"images/indicator.gif\" />"; //interactive
  }
  else if (objXMLHttp.readyState == 4 || objXMLHttp.readyState == "complete") {
    document.getElementById("status").innerHTML=objXMLHttp.responseText; // completed
	document.getElementById("form").reset();
  }
} 

//-->