Getting URL parameters using JavaScript

function getURLParameter(myParameterName)
{
    var sURL = document.URL.toString();

    if (sURL.indexOf("?") > 0) {
        var arrParams = sURL.split("?");

        var arrURLParams = arrParams[1].split("&");

        var arrParamNames = new Array(arrURLParams.length);
        var arrParamValues = new Array(arrURLParams.length);

        var i = 0;
        for (i=0; i < arrURLParams.length; i++) {
            var sParam =  arrURLParams[i].split("=");
            arrParamNames[i] = sParam[0];
            if (sParam[1] != "")
                arrParamValues[i] = unescape(sParam[1]);
            else
                arrParamValues[i] = "";
        }

        for (i=0; i < arrURLParams.length; i++) {
            if (arrParamNames[i] == myParameterName) {
                return arrParamValues[i]
            }
        }
    } else {
        return "";
    }
}

var _GET={}; 
for(var m, v=location.href.split(/[?&]/), k=v.length-1;k>0;k--) 
_GET[(m=v[k].split(/[=#]/))[0].toLowerCase()] = m.length>1?decodeURI(m[1]):""; 

var _GET = {};
for(var i,a,m,n,o,v,p=location.href.split(/[?&]/),l=p.length,k=1;k<l;k++)
  if(m=p[k].match(/(.*?)(\..*?|\[.*?\])?=([^#]*)/)){
    n=decodeURI(m[1]).toLowerCase(),o=_GET;
    if(m[2])for(a=decodeURI(m[2]).replace(/\[\s*\]/g,"[-1]").split(/[\.\[\]]/),i=0;i<a.length;i++)
       v=a[i],o=o[n]?o[n]: o[n]=(parseInt(v)==v)?[]:{}, n=v.replace(/^["\'](.*)["\']$/,"$1");
    n!='-1'?o[n]=decodeURI(m[3]): o[o.length]=decodeURI(m[3]);
}

function GetParams(sURL)
{
        if (sURL.indexOf("?") > 0)
        {
            var arrParams = sURL.split("?");
    			
		    var arrURLParams = arrParams[1].split("&");
    		
		    var arrParamNames = new Array(arrURLParams.length);
		    var arrParamValues = new Array(arrURLParams.length);
    		
		    var i = 0;
		    for (i=0;i<arrurlparams.length;i++)>
		    {
			    var sParam =  arrURLParams[i].split("=");
			    arrParamNames[i] = sParam[0];
			    if(sParam.length>2)
			    {
			        var temp='';
			        for(j=2; j<sparam.length; j++)<br="" mode="hold" />			        {
			            temp+= '=' + unescape(sParam[j]);
			        }
			        arrParamValues[i] = temp;
			    }
			    else
			    {
			        arrParamValues[i] = unescape(sParam[1]);			 
		        }
		    }
    		
		    for (i=0;i<arrurlparams.length;i++)>
		    {
			    alert( arrParamNames[i]+" = "+ arrParamValues[i]);
		    }
		}
}

</arrurlparams.length;i++)></arrurlparams.length;i++)>