function replace(string,text,by) {
    var strLength = string.length, txtLength = text.length;
    if ((strLength == 0) || (txtLength == 0)) return string;

    var i = string.indexOf(text);
    if ((!i) && (text != string.substring(0,txtLength))) return string;
    if (i == -1) return string;

    var newstr = string.substring(0,i) + by;

    if (i+txtLength < strLength)
        newstr += replace(string.substring(i+txtLength,strLength),text,by);
alert(newstr);
    return newstr;
}



function validate(){   	 
emails.name.value = replace(emails.name.value,' ','');
emails.last.value = replace(emails.last.value,' ','');
emails.email.value = replace(emails.email.value,' ','');

if(emails.name.value == "" ){alert("Please enter your name"); return false;}       	 
else if(emails.last.value == "" ){alert("Please enter your last name"); return false;}            	 
else if(emails.email.value == "" ){alert("Please enter your emai."); return false;} 
else if(emails.comment.value == "" ){alert("Please enter your comment"); return false;}  
  	 
      	 
     	 

			     
				               else return true;	
					}