//Global Form Validation 
function validate_required(field,alerttxt)
{
with (field)
  {
  if (value==null||value=="")
    {
    alert(alerttxt);
	return false;
    }
  else
    {
    return true;
    }
  }
}

// Show / Hide ONCLICK
function showstuff(boxid){
   document.getElementById(boxid).style.visibility="visible";
}

function hidestuff(boxid){
   document.getElementById(boxid).style.visibility="hidden";
}
///Email Validation
function echeck(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");
		  //alert(document.getElementById(obj.id).value);
		   //document.getElementById(obj.id).focus();
		   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 validateEmail(val, obj){
	emailID = document.getElementById(obj.id).id
	if (echeck(val)==false){
		document.getElementById(obj.id).value=""
		//jQuery('#'+emailID).focus(); 
		return false
	}
	return true
 }
 function validate_Email(val, obj){
	emailID = document.getElementById(obj.id).id
	if (echeck(val)==false){
		document.getElementById(obj.id).value=""
		//jQuery('#'+emailID).focus(); 
		return false
	}
	return true
 }
 ///// Numbers Only Validation
 function numbersonly(myfield, e, dec)
{
var key;
var keychar;

if (window.event)
   key = window.event.keyCode;
else if (e)
   key = e.which;
else
   return true;
keychar = String.fromCharCode(key);

// control keys
if ((key==null) || (key==0) || (key==8) || 
    (key==9) || (key==13) || (key==27) )
   return true;

// numbers
else if ((("0123456789+-").indexOf(keychar) > -1))
   return true;

// decimal point jump
else if (dec && (keychar == "."))
   {
   myfield.form.elements[dec].focus();
   return false;
   }
else
   return false;
}
<!--
function alpha(e) {
var k;
document.all ? k = e.keyCode : k = e.which;
return ((k > 64 && k < 91) || (k > 96 && k < 123) || k == 8);
}
// -->