function trim(s){
  while (s.substring(0,1) == ' '){
    s = s.substring(1,s.length);
  }
  while (s.substring(s.length-1,s.length) == ' '){
    s = s.substring(0,s.length-1);
  }
  return s;
}
function echeck(value){
	  	var re = new RegExp(/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i);
    	if (re.test(value)){
       		return true;
    	} 
    	else {
       		alert("Invalid Email Id");
    		return false;
    	} 
}
function valid(field){
	var re = /^[A-z0-9-'.'-','-'-'-' ']*$/;
	if (!re.test(field.value)) {
		alert("Special characters are not allowed!");
		field.value = field.value.replace(/[^A-z0-9-'.'-','-'-'=' ']/g,"");
	}
}