var xmlHttp
function checkmail(str)
{ 
	
    //-------------------------------------
   if ((document.frmsign.sign_up.value=="Enter your Email-id"))
	{
		//alert('enter your email id.');
		document.getElementById("signup").innerHTML="Enter your email id.";
		document.frmsign.sign_up.focus()
		return false;
	}
	else
		{
			var str =/[-a-zA-Z0-9_\.]+@[-a-zA-Z0-9]+\.[-a-zA-Z0-9\.]+/;
			var eflag = document.frmsign.sign_up.value.match(str);
			if(eflag!=document.frmsign.sign_up.value)
			{
				make_null();
				document.getElementById("signup").innerHTML="Please enter a valid Email ID.";
	           // alert("Please enter a valid Email ID.");
	            document.frmsign.sign_up.value="";
				document.frmsign.sign_up.select();
				document.frmsign.sign_up.focus();
				return false;
			}
		}
   
    //==========================================

    xmlHttp=GetXmlHttpObject()
    if (xmlHttp==null)
    {
        alert ("Browser does not support HTTP Request")
        return
    }     
    
    var url="sign_up.php"
    //url=url+"?uname="+str
    url=url+"?emailid="+document.frmsign.sign_up.value
    xmlHttp.onreadystatechange=stateChangedp1
    xmlHttp.open("GET",url,true)
    xmlHttp.send(null)
}
function stateChangedp1() 
{ 
    
    if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
    { 
        document.getElementById("signupdets").innerHTML=xmlHttp.responseText 
    } 
    else
    {
        document.getElementById("signupdets").innerHTML="<img src='../images/temp/loading.gif' border=0 alt=''>"
    }
} 
function GetXmlHttpObject()
{ 
     var objXMLHttp=null
     if (window.XMLHttpRequest)
     {
          objXMLHttp=new XMLHttpRequest()
     }
     else if (window.ActiveXObject)
     {
          objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
     }
     return objXMLHttp
}