function echeck(str)
{
	var at="@";
	var dot=".";
	var lat=str.indexOf(at);
	var lstr=str.length;
	var ldot=str.indexOf(dot);
	//alert(str.indexOf(dot));
	//alert(lstr);
	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-1))
	{
		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 || str.indexOf("!")!=-1 || str.indexOf("?")!=-1 || str.indexOf("$")!=-1 || str.indexOf("^")!=-1 || str.indexOf("*")!=-1 || str.indexOf("{")!=-1)
	 {
		alert("Invalid E-mail ID");
		return false;
	 }
	 return true;
}
function checkmain()
{
    var emailID=document.frmmain.Email;
    if (document.frmmain.Name.value == "" || document.frmmain.Name.value == "First name here")
    {
	    alert("Please Enter Your Name.");		
	    document.frmmain.Name.focus();
	    return false;
    }    
      
    if ((emailID.value==null)||(emailID.value==""))
	{
		alert("Please Enter your Email ID");		
		emailID.focus();
		return false
	}
	else if (echeck(emailID.value)==false)
	{
		emailID.focus();
		return false
	}    
	else if (echeck(document.frmmain.Email.value)==false)
    {
       	document.frmmain.Email.focus();
        return false;
    }			
	else
	{
		return true;
	}
}
function changename()
{
	if (document.frmmain.Name.value == "" || document.frmmain.Name.value == "First name here")
    {
	   document.frmmain.Name.value = "First name here";	    	   
    }	
}
function changenameblank()
{
	document.frmmain.Name.value = "";		
}
function changeemail()
{
	if (document.frmmain.Email.value == "" || document.frmmain.Email.value == "your email here")
    {
	    document.frmmain.Email.value = "your email here";	     
	}	
}

function changeemailblank()
{
	document.frmmain.Email.value = "";	
}