Email Validation by Javascript

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function EmailCheck()
{
var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
var str =document.getElementById('<%= TxtTo.ClientID %>').value;

if(reg.test(str) == false)
{
alert('Invalid Email Address');
document.getElementById('<%= TxtTo.ClientID %>').focus();
}
}

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