function contactform() {

    var name = document.getElementById("name").value;
    var deldate = document.getElementById("deldate").value;
    var mobile = document.getElementById("mobile").value;
    var email = document.getElementById("email").value;

    var focus = "";
    var errormsg = "";
    if(name.length == 0 ){
        errormsg+='Please enter your Name!\n';
        if (focus=="") focus = "name";
        document.getElementById("name").style.backgroundColor = 'red';
    }
    if(deldate.length == 0 ){
        errormsg+='Please enter your Delivery Date!\n';
        if (focus=="") focus = "deldate";
        document.getElementById("deldate").style.backgroundColor = 'red';
    }
    if(mobile.length==0){
        errormsg+='Please enter your Mobile Number!\n';
        if (focus=="") focus = "mobile";
        document.getElementById("mobile").style.backgroundColor = 'red';

    }
    else if(mobile.length!=8){
        errormsg+='Please enter only 8 numbers for your Mobile Number!\n';
        if (focus=="") focus = "mobile";
        document.getElementById("mobile").style.backgroundColor = 'red';
    }else if(!/^-?\d+$/.test(mobile)){
        errormsg+='Please enter only numbers for your Mobile Number!\n';
        if (focus=="") focus = "mobile";
        document.getElementById("mobile").style.backgroundColor = 'red';
    }
    if(email==''){
        errormsg+='Please enter your Email Address!\n';
        if (focus=="") focus = "email";
        document.getElementById("email").style.backgroundColor = 'red';
    }
    if(email != ''){
        if (email.indexOf('@')==-1||email.indexOf('.')==-1||email.indexOf('@.')!=-1){
            errormsg+="Please provide a valid Email Address!\n";
            if (focus=="") focus = "email";
            document.getElementById("email").style.backgroundColor = 'red';
        }
    }
    if (errormsg!=""){
        document.getElementById(focus).focus();
        alert(errormsg);
        return false;

    }else{
        return true;
    }
}