<a href="http://mysite?key=value">link1</a>

<a href="http://mysite#key=value" onclick="AJAXRequest('','','key=value');">link1</a>

for (i =  0 ; i < links.length; i ++)
{
	var tmp = links[i].href; 
	var page_param = tmp.split('?');
	links[i].onclick="AJAXRequest('','','"+page_param[ 1 ]+"');";
	links[i].href = page_param[ 0 ] + "#" + page_param[ 1 ];
}

for (i =  0 ; i < links.length; i ++)
{
	var tmp = links[i].href; 
	var page_param = tmp.split('?');
	links[i].setAttribute("onclick", "AJAXRequest('','','"+page_param[ 1 ]+"');");
	links[i].href = page_param[ 0 ] + "#" + page_param[ 1 ];
}

for (i =  0 ; i < links.length; i ++)
{
	var tmp = links[i].href; 
	var page_param = tmp.split('?');
	links[i].setAttribute("onclick", function() {AJAXRequest('','',page_param[ 1 ]);});
	links[i].href = page_param[ 0 ] + "#" + page_param[ 1 ];
}

function setupNewLinks(obj)
{
	// все ссылки внутри объекта obj в которых разрешен AJAX
	var links = getElementsByAttr(obj, "a", "ajax", "true");
	// перебираем ссылки
	var link;
	for (var i =  0 ; link = links[i]; i++)
	{
		link.onclick=function(x){return function(){AJAXRequest('','',x);}}(link.href.replace(/^.*?\?/,''));
		link.href = link.href.replace(/\?/,'#');
	}
}

var form;
for (var i =  0 ; form = forms[i]; i++)
{
	for(var j =  0 ; j<form.elements.length; j++)
	{
		if (form.elements[j].type=="submit")
		{
			form.elements[j].type="button";
			form.elements[j].onclick=function(y,x){return function(){AJAXRequest(this.name+'='+this.value,y,x);}}(form.id,page_param[ 1 ])
		}
	}
}

function(){AJAXRequest(this.name+'='+this.value,y,x); return false;}

var forms = getElementsByAttr(obj, "form", "ajax", "true");
var form;
for (var i =  0 ; form = forms[i]; i++)
{
	var page_param = form.getAttributeNode("action").value.split('?');
	for(var j =  0 ; j<form.elements.length; j++)
	{
		if (form.elements[j].type=="submit")
		{
			form.elements[j].onclick=function(y,x){return function(){AJAXRequest(this.name+'='+this.value,y,x); return false;}}(form.id,page_param[ 1 ])
		}
	}
}