function onlynumbers(e)
{
    var unicode = e.charCode ? e.charCode : e.keyCode;
    if( unicode != 8 )
    {
        if(unicode < 9 || unicode > 9 && unicode < 48 || unicode > 57)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    else
    {
        return true;
    }
}

   
function validate() 
{
	var done =1;
	if(document.contact_form.nm.value=="" || document.contact_form.nm.value=="Name" )
		{
			
			alert("Please enter your name");
			document.contact_form.nm.focus();
			
			done = 0;
			return false;
		}
	
		
	
	if(document.contact_form.email_id.value=="" && document.contact_form.email_id.value=="Email" )
	{
		
		
		alert("Please enter your Email Id");
		document.contact_form.email_id.focus();
		
		done = 0;
		return false;
	}
	if(document.contact_form.email_id.value!="")
		{
			
			var emailRegEx = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
			
			str = document.getElementById('email_id').value;
			
			if(str.match(emailRegEx))
			{
				done=1;
				
			}
			else
			{
				alert("Please enter a valid Email Id");
				document.contact_form.email_id.focus();
				done = 0;
				return false;
			}	
		}
				
}