function checkEmail(emailStr) {
var emailPat=/^(.+)@(.+)$/
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
var specialChars1="\\(\\)<>@_,;:\\\\\\\"\\.\\[\\]"
var validChars="\[^\\s" + specialChars + "\]"
var validChars1="\[^\\s" + specialChars1 + "\]"
var quotedUser="(\"[^\"]*\")"
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
var atom=validChars + '+'
var atom1=validChars1 + '+'
var word="(" + atom + "|" + quotedUser + ")"
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
var domainPat=new RegExp("^" + atom1 + "(\\." + atom1 +")*$")
var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
 
	return false
}

var user=matchArray[1]
var domain=matchArray[2]
if (user.match(userPat)==null) {
    return false
}
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
		return false
	    }
    }
    return true
}
var domainArray=domain.match(domainPat)
if (domainArray==null) {
    return false
}
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
   return false
}
if (len<2) {
   var errStr="This address is missing a hostname!"
   return false
}
return true;
}
 function formcheck()
{      
	if(document.form1.name.value == '')
	{
		alert("Please enter your Name");
		document.form1.name.focus();
		return false;
	}
	if(document.form1.email.value == '')
	{
		alert("Please enter your email");
		document.form1.email.focus();
		return false;
	}
	else if(!(checkEmail(document.form1.email.value)))
	{
		alert("Please enter valid email");
		document.form1.email.focus();
		return false;
	}	
}