Email Validation through RegularExpression Email Validtion

//Email Validation through RegularExpression Email Validtion
function ValidateEmail(strEmail)
{
var emailfromflag;
var emmailno=1;
var emailfrom =strEmail.split(",");
if( emailfrom.length > emmailno)
{
return false;
}
else
{
if((emailfrom[0]!= null)&&(emailfrom[0]!= ""))
{
var nare=emailfrom[0].trim();
emailfromflag=echeck(nare);
if(!emailfromflag)
{
return false;
}
}
return true;
}
}
function echeck(str)
{
var strValidationExpression = /\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;
if(!strValidationExpression.test(str))
{
return false;
}
else
{
return true;
}
}
//Email Validation through RegularExpression Email Validtion