javascript email check alert box

/**

* DHTML email validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)

*/

function echeck(str) {

var at=”@”

var dot=”.”

var lat=str.indexOf(at)

var lstr=str.length

var ldot=str.indexOf(dot)

if (str.indexOf(at)==-1){

alert(“Invalid E-mail ID”)

return false

}

if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){

alert(“Invalid E-mail ID”)

return false

}

if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){

alert(“Invalid E-mail ID”)

return false

}

if (str.indexOf(at,(lat+1))!=-1){

alert(“Invalid E-mail ID”)

return false

}

if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){

alert(“Invalid E-mail ID”)

return false

}

if (str.indexOf(dot,(lat+2))==-1){

alert(“Invalid E-mail ID”)

return false

}

if (str.indexOf(” “)!=-1){

alert(“Invalid E-mail ID”)

return false

}

return true

}

function ValidateForm(){

var emailID=document.frmSample.txtEmail

if ((emailID.value==null)||(emailID.value==”")){

alert(“Please Enter your Email ID”)

emailID.focus()

return false

}

if (echeck(emailID.value)==false){

emailID.value=”"

emailID.focus()

return false

}

return true

}

Enter an Email Address :

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