User name/password/email check and submit

Detecting user Names
function Accountcheck () {
var account = Document.validateForm.account.value;
var D1 = document.getElementById ("D1");
if (account = = "") {
d1.innerhtml = "* Please enter account name";
return false;
}else{
d1.innerhtml = "";
}

}

Verifying passwords
function Pass1check () {
var pass1 = document.getElementById ("Pass1"). Value;
var D2 = document.getElementById ("D2");
var reg3 =/^[0-9a-za-z]{6,}$/;
if (Pass1 = = "") {
d2.innerhtml = "* Please enter password";
return false;
} else if (!reg3.test (Pass1)) {
d2.innerhtml = "* Password should consist of more than six letters or numbers";
return false;
}else{
d2.innerhtml = "";
}

}

Verifying passwords
function Pass2check () {
var pass1 = document.getElementById ("Pass1"). Value;
var pass2 = document.getElementById ("Pass2"). Value;
var d3 = document.getElementById ("D3");
if (Pass2 = = "") {
d3.innerhtml = "* Please enter the confirmation password";
return false;
}else if (pass1! = pass2) {
d3.innerhtml = "* Password inconsistent";
return false;
} else{
d3.innerhtml = "";
}

}

//Verify the mailbox format
function Emailcheck () {
var mail = document.getElementById ("email"). Value;
var d4 = document.getElementById ("D4");
var reg6 =/^[\da-za-z]{1,}@[\da-za-z]{1,}\.com$/;
if (!reg6.test (mail) &&mail!= "") {
d4.innerhtml = "* Mailbox format error";
return false;
}else{
d4.innerhtml = "";
}
}

//Submit
$ (document). Ready (function () {
$ ("#register"). Click (function () {
var check1 = ac Countcheck ();
var check2 = Pass1check ();
var check3 = Pass2check ();
var check4 = Emailcheck ();
if (! ( Check1 = = False | | Check2 = = False | | Check3 = = False | | Check4 = = False) {
$ ("#registerForm"). Submit ();
}

})
})