var httpBaseURL = '/inc/searchpubmed.php?keywords=vaccine+AND+';

function getPM() {
	var keywords = document.getElementById("keywords").value;
	var field = document.getElementById("field").value;
	var boolean1 = document.getElementById("boolean1").value;
	var keywords1 = document.getElementById("keywords1").value;
	var field1 = document.getElementById("field1").value;
	var boolean2 = document.getElementById("boolean2").value;
	var keywords2 = document.getElementById("keywords2").value;
	var field2 = document.getElementById("field2").value;

if (keywords.trim()==""  && keywords1.trim()=="" && keywords2.trim()=="") {
		alert("Please enter at least one keywords!");
	}
	else {
		var url= httpBaseURL + keywords + "&field=" + field + "&boolean1=" + boolean1 + "&keywords1=" + keywords1 + "&field1=" + field1 + "&boolean2=" + boolean2 + "&keywords2=" + keywords2 + "&field2=" + field2;
		//alert (url);
		
		div_results1.setHref(url);
	}
}