function linkpop()
{
msg="" 
for(i=0;i<document.form1.length-2;i++)
 {
   	if(i==2 || i==5)
    { 
       if(document.form1[i].value.length==7)
       	msg=msg+"please enter the"+document.form1[i].name+"\n"
    }
	if(i==1)
    {
		if((document.form1[i].value.indexOf("@") == -1) ||(document.form1[i].value.indexOf(".") ==-1))
		{
  			msg=msg+"please enter the correct email id"+"\n"
		}
		else
		{
				if(document.form1[i].value.indexOf("@") > document.form1[i].value.indexOf(".") )
				{
					msg=msg+"please enter the correct email id"+"\n"
				}
		}
	}
	if(document.form1[i].value.length==0)
		msg=msg+"please enter the"+document.form1[i].name+"\n"
 }   
	if(msg=="")
	{
	window.open("link.php","submit_link","top=150,left=100,width=600,height=300");	
		
	}
	else
	{
		alert(msg)
		return false
	}
}