function validate_password(){
    document.getElementById('error1').innerHTML="";
    document.getElementById('error2').innerHTML="";
    var password = document.forms["change_password"]["password"].value;
    var confirm_password = document.forms["change_password"]["confirm_password"].value;
    var error = false;
        if(password==null || password==""){
            document.getElementById('error1').innerHTML=" *Please enter password";
            error=true;
        }
        else if(password.length<8||password.length>15){
            document.getElementById('error1').innerHTML=" *Password must contain 8-15 symbols";
            error=true;            
        }
        else if(!validPassword(password)){
            document.getElementById('error1').innerHTML=" *Password must contain at least one digit, lower and upper character";
            error=true;             
        }
        if(confirm_password==null || confirm_password==""){
            document.getElementById('error2').innerHTML=" *Please confirm password";
            error=true;
        }
        else if(confirm_password!=password){
            document.getElementById('error2').innerHTML=" *Passwords are not equal";
            error=true;            
        }

        if(error) return false;
        else return true;
}
function validPassword(word){
    var result=false;
    var number=false;
    var lower=false;
    var upper=false;
    var reg_number=/[0-9]+/;
    var reg_lower=/[a-z]+/;
    var reg_upper=/[A-Z]+/;	
        if(reg_number.test(word)) number=true;	
        if(reg_lower.test(word)) lower=true;
        if(reg_upper.test(word)) upper=true;
        if(number&&lower&&upper) result=true;
    return result;
}