/**
You can reuse this function for removing any character from string entered 
in input field in your form. Just add 'onclick' attribute for submit button 
and set some id for your form. Example:

onclick="javascript:return removeCharFromString('%',this.form, 'query')"

*/

function removeCharFromString(charToRemove, currentForm, fieldName){
var form = currentForm;
var formId = form.id;
var prev='';

//get value from 'currenForm' 's input field name described with 'fieldName'
for (var c = 0; c < document.forms[formId].elements.length; c++)
   if (document.forms[formId].elements[c].name == fieldName){
      prev = document.forms[formId].elements[c].value;
   }
var lquery = prev;

 //alert("Initially, string equals " + lquery);

while (lquery.indexOf(charToRemove)>-1) {
  var dec = lquery.replace(charToRemove,'');
  lquery = dec; // string now equals converted value
}

 //alert("Now, string equals " + lquery);

//set modified value before submitting form
for (var c = 0; c < document.forms[formId].elements.length; c++) 
   if (document.forms[formId].elements[c].name == fieldName){
       document.forms[formId].elements[c].value = lquery;
   }

form.submit();

}

function entersub(charToRemove, currentForm, fieldName) {

  if (window.event && window.event.keyCode == 13){

		var formId = currentForm.id;
		var prev='';
		//get value from 'currenForm' 's input field name described with 'fieldName'
		for (var c = 0; c < document.forms[formId].elements.length; c++)
		   if (document.forms[formId].elements[c].name == fieldName){
		      prev = document.forms[formId].elements[c].value;
		   }
		var lquery = prev;
		
		 //alert("Initially, string equals " + lquery);
		
		while (lquery.indexOf(charToRemove)>-1) {
		  var dec = lquery.replace(charToRemove,'');
		  lquery = dec; // string now equals converted value
		}
		
		 //alert("Now, string equals " + lquery);
		
		//set modified value before submitting form
		for (var c = 0; c < document.forms[formId].elements.length; c++) 
		   if (document.forms[formId].elements[c].name == fieldName){
		       document.forms[formId].elements[c].value = lquery;
		   }
    }
  else
    return true;
}