Text focus JS

<br /><input type="text" name="username" style="width:200px" id="username" onfocus="if(this.value=='Enter your Emailid as your username') this.value='';" onblur="if(this.value=='') this.value='Enter your Emailid as your username';" value="Enter your Emailid as your username"/> <br /> <br /> <br /> <br /><script language="JavaScript"> <br /> <br />function validate() <br />{ <br /> <br /> var firstname=document.form1.firstname.value; <br /> if(firstname==""){ <br /> alert("Please enter the your First Name");document.form1.firstname.focus();return false; <br /> } <br /> <br /> var lastname=document.form1.lastname.value; <br /> if(lastname==""){ <br /> alert("Please enter the your Last Name");document.form1.lastname.focus();return false; <br /> } <br /> <br /> var street_address=document.form1.street_address.value; <br /> if(street_address==""){ <br /> alert("Please enter the your Address");document.form1.street_address.focus();return false; <br /> } <br /> <br /> var city=document.form1.city.value; <br /> if(city==""){ <br /> alert("Please enter the your City or Town");document.form1.city.focus();return false; <br /> } <br /> <br /> <br /> var country=document.form1.country.value; <br /> if(country==""){ <br /> alert("Please enter the your Country");document.form1.country.focus();return false; <br /> } <br /> <br /> var postcode=document.form1.postcode.value; <br /> if(postcode==""){ <br /> alert("Please enter the your Postcode");document.form1.postcode.focus();return false; <br /> } <br /> <br /> var telephone=document.form1.telephone.value; <br /> if(telephone==""){ <br /> alert("Please enter the your Telephone No");document.form1.telephone.focus();return false; <br /> } <br /> <br />var username=document.form1.username.value; <br />if(username=="0" || username=="" || username=="Enter your Emailid as your username") <br />{ <br />alert("Please enter Your Email address"); <br />document.form1.username.focus(); <br />return false; <br />} <br /> <br />if(valemail(username,"Please enter valid Email ID!") == false) <br />{ <br />document.form1.username.select(); <br />return false; <br />} <br /> <br /> <br /> var password=document.form1.password.value; <br /> if(password==""){ <br /> alert("Please enter the your password");document.form1.password.focus();return false; <br /> } <br /> <br /> var confirmation=document.form1.confirmation.value; <br /> if(confirmation!=password){ <br /> alert("Your confirmation password is not match with your password");document.form1.confirmation.focus();return false; <br /> } <br /> <br /> var number=document.form1.number.value; <br />if(number=="0" || number=="" ) <br />{ <br />alert("Please enter the Security Code");document.form1.number.focus();return false; <br />} <br /> <br />return true; <br />} <br /> <br />function valemail(field,alerttxt) <br />{ <br /> with (field) <br /> { <br /> var atpos = field.indexOf("@") <br /> var dotpos = field.lastIndexOf(".") <br /> var lastpos = field.length - 1 <br /> if (atpos < 2 || dotpos - atpos < 2 || lastpos-dotpos > 4 || lastpos-dotpos < 2 ) <br /> { <br /> alert(alerttxt) <br /> return false <br /> } <br /> } <br />} <br /> <br /></script> <br /> <br />