function validate_email(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 validate_form( )
{
var strUserName     = document.contact_form.uname;
var designation     = document.contact_form.desig;
var company         = document.contact_form.comp;
var Address         = document.contact_form.addr;
var phone_no        = document.contact_form.ph_no;
var emailID         = document.contact_form.email;
var Message         = document.contact_form.comment;
var noalpha = /^[a-zA-Z]*$/;
var nonums = /^[0-9]*$/;

if ((strUserName.value == null) || (strUserName.value == ""))
    {
        alert("Please Enter User Name.");
        strUserName.focus();
        return false;
    }
 else if (nonums.test(strUserName.value))
   {
     alert("Please enter letter in the \"Name\" field.");
     return false;
   }
else if ((designation.value == null) || (designation.value == ""))
    {
        alert("Please Enter User Designation.");
        designation.focus();
        return false;
    }
 else if (nonums.test(designation.value))
   {
     alert("Please enter letter in the \"Designation \" field.");
     return false;
   }
 else if ((Address.value == null) || (Address.value == ""))
    {
        alert("Please Enter User Address.");
        Address.focus();
        return false;
    }
else if ((phone_no.value == null) || (phone_no.value == ""))
    {
        alert("Please Enter Phone No.");
        phone_no.focus();
        return false;
    }
else if (noalpha.test(phone_no.value))
    {
     alert("Please enter number in the \"Phone\" field.");
     return false;
    }
else if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email ID")
		emailID.focus()
		return false
	}
else if (validate_email(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
else if ((Message.value == null) || (Message.value == ""))
    {
        alert("Please Enter Message for us.");
        Message.focus();
        return false;
    }

return true;
}


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