function checkRequired(form_id) 
{ 
var frm = document.getElementById(form_id); 
var fields = ['txtname','txtphone','txtemail']; 
var mail_patt = /^[A-Za-z][\w-\.]*\@[A-Za-z0-9]+(\.[\w-]+)*\.[A-Za-z]{2,3}$/; 
for(var i=0; i<fields.length; i++) 
{ 
if (frm[fields[i]].value.length < 1) 
{ 
alert ('Please fill all Required fields.'); 
frm[fields[i]].focus(); 
return false;  
} 
}
/* if ( frm[service[0]].checked==false &&  frm[service[1]].checked==false &&  frm[service[2]].checked==false && frm[service[3]].checked==false && frm[service[4]].checked==false && frm[service[5]].checked==false)
{
alert("Please select at least one Service");
frm['txtemail'].focus(); 
return false;
}*/
 if(frm['txtemail'].value!="")
{
if (!mail_patt.test(frm['txtemail'].value)) 
{ 
alert ('Invalid E-mail Address'); 
frm['txtemail'].focus(); 
return false; 
}  
}
return true;  
}
function isNumberKey(evt)
{
//alert("Checking");
var charCode = (evt.which) ? evt.which : event.keyCode
if(charCode>=48 && charCode<= 57)
{ return true;}
else
{alert("Only digits allowed");
return false;} return true; }